Ok if you really want to make the transition to cash games.
- There is literally a ton of stuff on managing a bankroll on this site, use the search feature and you find some good threads on it. Generally you should have 20 buyin's for the game you want to play, so you would be falling on the nl$10 level and able to move up when you have $500+ to nl$25.
- Buy into game's for the max (ie 100bb) in order to take advantage of any implied odds
that the table may offer. This is one of the major differences in sit and go play and deep stacked ring games. Where it may be correct to fold small pairs late in a sit and go to a raise its usually a massive mistake to fold them in a cash game.
- Get some form of pokertracker if you dont have one already, analyise you hands and be prepared to post any trouble hands in HA for some of the more experienced ring game players to have a look at. Play a predetermined amount of hands at each level before you move up, and measure that figure in the ten's of thousands.