From my experience

1. Read a lot, articles, books, and mainly FTR posts
2. Post hands that you had trouble with
3. Discuss the game with friends
4. Pick your game - spend a short amount of time playing different varieites - Sng, MTT, no limit, limit, pot limit, and then pick your game. It does not really matter which one your pick, but stick with one to begin with. There are a lot of subtle differences between the varieites of holdem, excel in one of them