I would have to agree with a lot of the authors here, especially Laila and Kat. Here's a few hints from me... in fact, I would say it's my top ten - just in no particular order:-
1.
time and commitments. I only write one story at a time - well one and a half when I'm doing a join fic with Holly, so that helps me, because I'm not very good at multi-tasking and lose my concentration with a story very easily if I have more than one project going at once, but that's just me. There are a lot of authors out there that have 4 or 5 stories going at once, and I can only surmise that it must help with the writer's block to have more than one story to write about.
2.
planning. Fanfic is just like writing any story. It has a beginning to suck people in, a middle to keep them interested and an ending to bring it all together and leave the reader satisfied. To do that, you need to know what you want to happen, how it starts, what happens in the middle and how it ends. Personally, when I’m at the beginning of a story, or half way through, at the end of my word file I have a list of events sometimes with a quick outline of what I want to happen. This is so that I don't get lost in the chapters and forget where I’m driving the story to. Think of it as a road map. Sure this can change, so be flexible - as Kat said, your characters take on a life of their own, so if they change direction on you, don't be afraid to look at your road map again and see if there's another way to get to your destination. But most importantly is know where you're going. A story with no ending in sight is just painful. Remember the old adage, All good things must come to an end.
3.
characters. As Kat said, you can love them, hate them or be indifferent to them, but remember they are an integral part of your story so treat them right. Keep the characterisation constant - if someone's a bitch at the beginning and has a change of heart, explain it so the reader understands, otherwise you'll lose your audience. Fill them out, don't make them 2 dimensional. If you've put in a physical description, remember it - don't change your character's hair colour or eye colour halfway through unless you can explain it.
4.
spell check and grammar. Use a dictionary. Use a thesaurus. Expand your knowledge base. There's a great site
http://www.dictionary.com it gives you access to both dictionary and thesaurus. If you're using another language, find a translator, or ask someone on the board if they know how to speak the language. Use the right syntax and check your work. Nothing worse than spelling errors and grammatical errors throughout a story.
5.
Research! Please, oh PLEASE, don't make your readers suffer through information that they will know is incorrect. If you're taking your characters to a location that's real, research it! Look it up. If you have access to the board, then you'll have access to the biggest encyclopaedia known to man - THE INTERNET! You can find almost anything on here, so use it to your best advantage. I've got the US White Pages, Mapquest and a host of other sites bookmarked for frequent reference - and don't forget to research your characters that are real - i.e. Elijah, Orli, Dom, Billy etc... if they're real, at least try to get the basics right before using poetic license to change parts of them - if you are going to blatantly change them, it might be an idea to advise your readers in your disclaimer to avoid disappointment.
6.
Accept Criticism. Ask for it, even. You won't get better unless you know what's wrong with it. Don't take the criticism to heart, because it's not personal. If someone tells you that the paragraph doesn't fit in, or you've changed the personality of a character and it doesn’t sound right, it's not because you're a terrible writer and they hate your work. It's because sometimes when you get lost in writing, you "lose the plot" yourself and forget what you've already done. Take it on board, decipher if it's helpful or constructive criticism. Ask for a second opinion from someone else if you have to. Remember, to learn to do something right, you're going to make a few mistakes. We're all fallible, and none of us have not written something that didn't suck, or needed to be re-done. If the story didn’t work out, stick it in a draw and start again. Don't dwell on it, and don't let it break your confidence. Everyone has a story in a drawer.
7.
Notes. Yep, you've written your story, or you're in the process of writing it. Don't get me wrong, no one knows your story like you do, but even you can't remember EVERYTHING. All great authors (Stephen King, JK Rowing, Ann M Martin just to name a few) have folders of notes on their characters, their family trees, important idiosyncrasies that only that character does/has, birth dates, physical descriptions, important events, etc. Put them in bullet form for quick referencing, and possibly note which chapter it is written in, in case you need to look it up. On a personal note, my story
Pandora's Box, I’m currently writing Chapter 131 (I’ve only posted 13 on this board). I have to refer back to characters I’ve mentioned, what I’ve said about them, double checking surnames, descriptions, actions, statements, ages etc. After 131 chapters you tend to forget what you've written in chapter 10, you know what I mean?
8.
Credit. If you didn't write it, don't forget to give credit to the person that did. If you mention a song name, try to worm the artist's name in there too. Add it into your disclaimer at the beginning. After all the hours you've put into your creation, you don’t want to get done for breach of copywrite.
9.
Patience. Yep, you gotta have patience. There will be days when you just can't seem to get into the mood to write. There will be days when writer's block pokes it's tongue at you and says "Gotcha!" and there will be days when everything you write is crap, crap, crap. I've deleted entire chapters before because I thought it sucked and didn't fit in with where I was going. I've cut and paste paragraphs, and rearranged the order of events. I've gone back and changed what people look like, or what they said, or added in something I think that should have been there originally. Your stories become like your children, so you must have patience with it.
10.
Love. Don't write for the fans. Don't write for the fame. Don't write for the money. Write for yourself, the story inside you that must get out and write for the love of writing. Every now and then you'll end up with a story that just grips you with both hands and won't let go. It must be written. Yes, it'll take time, it'll take commitment, it'll take patience, and energy, and most of all it'll take love.
Good luck, and I hope to see your work on the board!