You need a bit more ninjas for nice line ups. I guess you play less than a week, ne?
So you will have Kakashi soon - he's good at chasing and it's nice for low level line ups.
Personally I prefer Hinata as a tank over Gaara.
Gaara's mystery is slow - needs 20+60 chakra points.He buff up wind ninjas so it's good to have at least one other wind shinobi in your team. He's immune to
low float, hight floar, repulse and kd + his shield regenerates every turn.
Hinata on the other hand is very good at chasing + got passive acupuncture (and your enemy can't use chakra skill for 3 turn).
You should collect some more ninjas and summons (when you reach 50 lvl).
For now I can suggest that:
You skills should be: 2-2-2-2-1 (not sure at wich lvl what skill you unlock, so you may improvise a bit)
Haku is not a bad option since he'll buff you up:Skills are still 2-2-2-2-1
When you get Kakashi may try:
(skills 2-2-3-2-1)
Hope I was helpfull, even just a bit<:3_60:>