There is very little you can do to influence the outcome at roulette. Therefore, rather than try to influence or predict the outcome, a good strategy would be to ride on the outcome and vary the intensity of betting appropriately; more as you win, less as you lose.
Make a betting selection(s) or establish a pattern of play to your liking and stick to it. Give preference to high-odds bets and don't plan to win every spin of the wheel (you can't have both). These combined with a suitable money management system, like the Paroli system, should give you the opportunity to be a winner.
Play to win to quit a winner. Don't play to WIN THE SPIN - it's the worst strategy.
See 
Kanzen's Roulette Strategy - Award-winning information site.
