I have a $50 Bankroll(almost $60 in 9hrs of playing time) and am playing .05/.10 LHE at pokerstars. How big should I get my bank roll before I consider moving up to .10/.20? I also like to play NLHE, but haven't, yet. Should I mix it up or stay with LHE? Should I stay away from sng's and tourney's for a while?

Thanks
Bill