[soah]

I assume you want to play 6-max? I'd buy in full at the NL25 or NL50 games to start. The players at those levels are so passive and love to slowplay so much that you're not going to face a lot of tough decisions for your stack... sometimes those games feel almost like playing limit because half the players never bet more than the minimum. You don't need to spend long playing those games; anyone with solid fundamentals should easily beat the games. But it's nice to get your feet wet in the kiddy pool while you figure things out. If things are going well over 500-1000 hands you can move up.

Jumping into the 2/4 or 3/6 games would almost certainly be a mistake. There are plenty of players there that are just waiting to take pots away from you, and if you are not familiar with NL you may have a difficult time interpretting their bets correctly while also giving away information about your own hand. If you really insist on jumping into these games I'd buy in for perhaps 40bb and just play solid preflop/flop poker. With this strategy you will not have to worry much about letting go of TPTK or overpairs, and you can observe the other deep stacks playing against each other to develop your hand reading before you end up in those spots yourself.