For ring games never invest more than 10% of your total bankroll on a table. For tourny's its even tighter, only 2% of your bankroll should be in a tourny. Even the best players only
cash a small margin of the time. Don't expect to get payed every game you play. Take the loss's as they come and try to win big when the win's come your way.
The best advice I can give is don't overplay your bankroll. Stay strict to the numbers above and you should do find.
Good luck at your tables