I suggest focus, like surviva says, on one type of game. I would choose whatever you like best. I play cash because I rarely have an hour I'm SURE I can dedicate to pokerz. With cash, I can leave any time something comes up (I have 3 kids).

Find something you like and are winning at and get good at it, build your roll. I disagree that SNG's will teach you little. Playing them well requires hand reading, the essential skill of poker.

The big key is to find games where you have a skill advantage and profit. As the profits come in, you can build a roll and learn other types of games.