Roulette Skillz?

So me and some friends went to Turning Stone (casino) last night. I went in with $0, borrowed $20, then came home with $100. I was horrible at blackjack and the poker seemed downright intimidatin. However, roulette seems to be the easiest game besides pressing buttons. I stuck to the outside most of the time and my gut feelings saved the night. I know there are books that goes through every trick of the game, but for those who gamble for fun, got any tips? Going back this weekend with pops.