Can't help with specifics but check combos via Ninja > show combos; maybe write it out and test it against Kakashi's clone in Konoha. As for summons, if your team has a gap combo-wise (say, your combos always end at Hinata's chase (causes knockdown), use a summon that takes advantage of knockdown. And mysteries depend on the team too, but the one that causes sleep is pretty valuable.

My personal strategy is to stall with clones/shields until the rounds go by and I can set opponents on fire again :). I have Great Ninja War Kiba, Kakashi, Kabuto; Kakashi is really squishy though so I use him to stall until my main can get through both uses of Dragon Flame before you have to wait 4 rounds. Meanwhile Kabuto keeps Kiba/main alive and Kiba autoheals Akamaru and himself. You could go for a pure damage or pure defensive team. Whatever feels right~

Hope this helps!

Well i am using at the moment Hinata , Sasuke and Sai but i am kinda tired of them cuz max combo they can output is just 8 i have seen other people whit combo's that go like 13 and even further

This guy posted some good lineups..

http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=2275&highlight=Strategy%2Bfor%2BFire%2Bmain

I'm using Sasuke Kabuto Hinata, with Chameleon summon. Gives me 9 combo each time :D

this is kinda not working out for me

Use this it very good and get's about 27 hits on a kakashi clone(about 15 in a regular fight)
Make sure to use dragon flame just,blue fire ball,genjutsu mirror,phoenix fire chase,death mirage and get the chameleon summon

Does some one have Fire main . Karin . Sasuke . Hinata and tell me a little bit more about this combo cuz i want to know hm is combo , hm hits and pros and cons to that formation