Ok.
In my country tip is not significant because waiters (sales girls and boys) get paid, it's not a matter of contention unless when you go to some high-end places and the people there (not necessarilly waiters) feels they are entitled to your money or they won't serve you right.
I can't say for sure if the pay is good as there is no standard but it's normally comparable to what other regular folks earn unless your place is really small or your boss really greedy.