Say I was an aspiring young boy who wanted to become talented at flash, and he asked his idol Craig Stern how he got around to learning flash, what would you say to me?
Find some good tutorials to help you, and practice, practice, practice! Start by making very small games; they are much faster to make, and you'll learn a lot with every game you make, so it pays to make a lot of them relatively quickly at first. Don't make something big like an RPG until later.
(I am a huge hypocrite, of course, because I started off by making Telepath RPG: Chapter 1. In retrospect, however, that was probably a mistake. I would have learned to program much faster if I'd started off with more, smaller, easier projects first.)