We don't have many expressions for that, however there are some expressions helpful for you.
Volleyball- 배구
Let's Go- 가자(literally), 아자! 잘하자! 이기자!
Nice hit/spike- 잘했어! (literally well done), or you just can say in English.
You can do it- 할 수 있어!
Nice serve- 잘했어! (literally well done), or you just can say in English.
Nice pass- 잘했어! (literally well done), or you just can say in English.
Nice Set- 잘했어! (literally well done), or you just can say in English.
We got this- You mean, you won, right? then 이겼다! 승리했어요.
I play volleyball- 배구를 하다 / 배구를 합니다 / 배구 시합을 해요 / 배구 시합을 합니다.