Pencil and paper still work fine too. Always bet the last number that was hit. Back to back hitting of numbers seems to happen quite often. Always play the green zeros. At least a split.
Some tables have only one zero.
Get in and get out. If you win, double your buy-in, it's time to leave. If you lose your buy-in, leave, try it again later. This is the easiest game on the casino floor to play, but remember it has the worst odds of winning. Besides the occasional tip, sometimes bet an extra check for the dealer.