However, there is no obligation to tip whilst you play. There's usually a prominently placed tip box in the majority of the live dealer tables if you're feeling particularly generous, and you can always expect a nice 'thank you' in the chat box after sending some money the dealer's way. The croupier will not wait for players to make their bets, and will simply start each round at fixed time intervals.
The croupier will set the wheel in motion at regular intervals and spin the ball around the outside of the wheel, just like at any land casino. Within the roulette window you have a smaller window that shows a live feed of a croupier (roulette dealer) and a real life roulette wheel. The whole live dealer roulette tables work pretty much how you might expect them to work.