You won't make a single dollar playing low limit poker live in casino's. The rake is simply too high to beat. Don't waste your time. The minimum you would have to play would be 4/8 to see any type of small return and you must be good. A great limit player can probably grind out about 10$ an hour max play 4/8 limit kill. I would say maximum too. Your better off playing 8/16 limit or playing No Limit 1/3 - 300 buy in game.
Trust me you will not make money long run playing 2/4. I been playing poker a long time now and know all the specifics of every game, hourly take etc.