it is less risky to be aggressive in rings games than you think. When you first start, don't get overambitious. Wait until you are in late position, with something like a suited connector. No raisers before you, no more than one caller. Raise 4xBB. Bet 3/4 the pot on the flop. check/fold from there out (unless you make a hand, then play it accordingly). Doing this will cost you less than 1/5 of a buy-in, and i bet you will win 4/5 times.