Hey there! It hasn't been a long time ever since I started to post some of my stories here in AFF, just over a year im guessing. The most important thing is that while you write, make sure it's something that you like, that you enjoy that way it's ten times more fun and exciting^^ Maybe for a first story, go with something your more comfortable with writing? Then from then don't be afraid to go into the genres that can challenge you. Good luck on your first story, all the best!! :D