The best way to win money at casino's is to be good at the game you play.
You need to know the rules of how the game of roulette works.
Believe only proven roulette tips, there is a lot of bad roulette information out there, you need to play with only the truth of what happens in certain roulette events.
You need a system, not just luck.
You need a plan of what to do in different situations.