The number once piece of advice I can give any aspiring writer is to read. Read everything in the genre you want to write. Read lots of books on writing and how to get published. Read for fun. Just read. The best writers I know started out by just loving books. Every book I pick up teaches me something new, a turn of phrase, a word I don't use enough, a brilliant plot point, all of that is important. Every new author you add to your reading list is another mentor for you. Take advantage of the tools they offer in the form of entertainment.