you need to upgrade your hinata to 3* and sasuke too

for sa you will need sai(2*), sakura(2*), sauke atleast 3*

upgrade your equipments, use basic team 7 or for now you use your best ninjas:

fire main, kurenai, kakashi, gnw shino

for arena you need to make random teams as required by the mission to get points.

There is a guide for SA Hanzo for every main:

http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=7742&extra=page%3D1