The biggest pitfall to avoid is not writing. Not writing is really, really easy to do, especially if you're a young writer. The hope that elves will come in the night and finish it for you, is a very common one to have. That is my main recommendation - you have to write, and you have to finish what you write and beyond that, it's all detail.
Neil GaimanI was a scholarship minor public school day boy at Ardingly College and later Whitgift School. Then, straight into work as a journalist - a wonderful thing for a writer.
Neil Gaiman