go for this as you are in beginning stage.
x x x
Sasuke Main hinata
Sakura x x


in place of sakura, karin is recommended and kabuto will be a good choice either... it will give you a good combo of 10 or 9 depending upon what you choose.

i have used karin config for last upto 55 level, you also want to unlock tobi as soon as you can with survival points as he is doing good with fire main.

Sasuke Main Clone
x Tobi Hinata
x x x

this is my current config with shark summon gives me 8 combos but very high damage to other team on level 63, ino is good for chaos team (in arena i have done ino shika fire main tobi).

p.s. gaars is good in ranked battle for fire mains, it doesnt have much good combo with fire main in other places.