Tristana is a well know adc that scales and becomes really strong late game. She has great wave clearing abilities: Damaging monsters nearby when killing one, her E is great to clean and Q allows her to clean even faster. W can also be used to clear, but it should be mostly used for ganks and mobility around the jungle. Her W can also be used as a way to run away from enemies or to steal drags.

Tristana is REALLY WEAK early game, but really weak. If you do not properly kite and get a good leash, you can have a very bad time. The circuit I would suggest is getting leashed on blue by your team, going red and raptors (Lvl 3), after this you can gank and continue cleaning jungle until you have 1300 so you can buy noonquiver and AFTER THIS POINT, you have passed Tristana's early game and she becomes way stronger.

With noonquiver now Tristana clear waves much easier and ganks are super successful. Beyond this point, Tristana can clear camps and continuously gank.