In spite that fact that your probability to lose money at the roulette table is much higher than the probability to win. The only thing you need to do is to adhere your own money management strategy. Remember that playing roulette you should bet only that amount of money which you are ready to lose. Do keep on the razor-edge. Be calm and be ready to stop and leave the table.
Another tip is to be faithful to yourself. If you are cautious player make small bets about 1% of your total sum. If you like to risk increase you bet in three times up to 3%, or even in five. But do not lay a money on the table at once. Follow your course and be firm no matter what.
Sometimes you need to make pauses while playing. It is necessary in case you are losing or winning as well.
The basic principles of money management are the same for online and real casino.