I completed this advice bit a while back. However, I have a couple pieces of advice to add. I know that technically this isn't a fanfiction. But I feel that I should share this advice with everyone, including starting writers.
1. Don't write in script. Not only is it against the rules here, it seriously devalues your story. Quite a few people here have pointed that out to me when I first started writing fanfiction. Especially in my Lincoln Phantom story.
2. Never update too often. This can be a problem because your followers will never be able to keep up with you. This could also cause you to make mistakes.
3. Never give in to any requests that make you uncomfortable. Just say No and explain that it makes you uncomfortable, and if they are rational, they will understand completely.
4. Remember to never take a fanfiction too seriously. It's just fiction, even if you find it weird or gross. Going along with it is encouraged, but never take it too seriously.
5. Don't let the trolls or haters get to you. They are everywhere on the internet and they just want attention. I may have said this in the first chapter. Oh well. So nice, you gotta hear it twice.
6. It's all about having fun. If you're not having fun, then take a break. We understand.
7. No matter how bad it may seem, never tell another writer how to write their story. It's very disrespectful. That is, unless said writer asks for your help.
8. If you're gonna write about a heavy topic (depression, suicide, etc), make sure to warn everyone in the story's description. People have triggers and sensitivities.
9. If you plan on writing satire, please do it properly. There is a line between satire and straight up making fun of something.
10. Don't hate write about anything or anyone. Leave the drama in your stories.
11. Don't follow a story just to hate on it. If you hate it, don't read it, simple.
12. Don't quit a story if people aren't liking it. Just ask for advice and try to turn it around.
13. Once you post or update a story, don't check for reviews every 5 minutes. If you do your best, your story will get by on its own.
That's all of the advice that I have. Thanks for taking the time to read it.