Roulette is a casino game named after a French diminutive for little wheel. In the game, players may choose to place bets on either a single number or a range of numbers, the colors red or black, or whether the number is odd or even. (Wikipedia)
For first it may seems to be complicated,but once if you understand the rules,it can be realy fun game.
But if you want to go deeper in this game,you need to calculate odds,you need to develop your own strategy,and you need a lot of patience.
Let's see the odds :
I did not recommend double zero roulette for you,the house edge is bigger than the single zero.
At the single zero roulette the house edge is 2.7% while the double 0 gives them 5.26% edge.
If you want to practice roulette without any risk,i recommend you online games like this.