First you exchange your fun money for roulette colour chips , you then place your chips on the table.
The dealer will spin the ball. When the ball stops the dealer will remove all losing bets and pay all winning bets.
The odds
A bet placed directly on a number pays 35-1
A bet placed on two numbers pays 17-1
A bet placed on three numbers pays 11-1
A bet placed on four number pays 8-1
A bet placed on six numbers pays 5-1
Columns and Dozens pay 2-1
Red/Black/Even/Odd, 1-18, 19-36 pay Even Money
If the ball lands in Zero all columns/dozens and even chances bets lose
10-12 players at one time.