I would start at 25NL or PL. Get used to online poker while risking less of your bankroll. Once you get used to playing, start playing 3 or 4 tables at once. Once you are comfortable with that, move up to $50 games. You should have at least $2500 in the roll before trying $100 games. You should be no where near the 1/2 games yet ($200PL).