mate you have to upgrade your heroes for your main use kokos,naruto,sasuke,sakura but sakura from ninja war if you have her next try kakshi gaara sasuke and kokos, you can try diffrent line ups just upgrade them alot
At your level, the lineups probably doesn't matter as much, so *ing to some kabuto hinata and sasuke lineup would work until you unlock more ninjas. You can try Kimimaro, Gaara and kabuto for a Poison Tai team if you have that talent unlocked - can't really remember when those stuff are available. Can do double heal with kabuto and your water main.
if u had other ninjas you can try this.... BASIC LINEUP FOR ALL MAIN ( Earth, Fire, Ligthning,Water and Wind ) http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=17007&fromuid=194789 (Source: Naruto Online Forum)