During the week the best sport really is horse racing, although it is for people who are a bit more advanced. Other than that lately theres been IPL cricket. I think there is one match in a few hours and the odds are always low which are good for turnover.
When the World Cup starts that will be great for getting bets in aswell!
As for your 2nd question – It doesnt matter I rate. You can pick and choose which one u wanna do first. As long as you have turned over everything once u wanna withdraw.