In tournaments you've got to worry about your tournament life a good portion of the time. Cash games just simply are not like that. You've got to always evaluate your pot odds
. This means if somebody puts you all in for your whole stack and you've got 3:1 with two cards to go and you've got a nut flush draw, you may have to call off your chips many times.
The fact of the matter is that in the long run, you'll hit a large profit by playing properly. The problem here is that the long run is longer than most people realize. That's why it is important to play inside of your bankroll. I can give you one suggestion though.
Start out tight tight tight and write down a list of hands you play. Mark down whether you win or lose with em and how you play them. Then, gradually expand your game outward. This way, when you're experimenting and are having a bad run, you always have a safety point for something you know works.
The main thing is to play well within your bankroll. I'd say you shouldn't ever put more than 2% of your roll on any one table at any given time if you want to play it safely.
I hope this helps. Good luck!