It's better to focus on the bot lane as Kha since you will have to get drakes and it's also important to focus on squishes and let your team deal with the tanks while you focus on the squishy champions. Q evolve will help you in early and in late to pick kills. R will help you to engage constantly and eventually pick up a kill. It has a huge impact in the late game. E evolve will help you to get out safely in the late game after picking a kill and will give you a huge jump range. Cool-downs (ability haste) will help you a lot in the late games and can decide the game.