Best line-up and best combo pls

Um, as a level 30 you should probably be starting to diverge from using Team Seven... maybe get a three star like Kakashi or Zabuza (both of whom I got via Seal Scrolls, I think). Three star Karin and an awakened Sasuke and... whoever works well with them (check your combos). I'd say to pick a team that works and focus on upgrading them in stars, magatama, equipment, cultivation, etc. until you're higher and need a new team. Hope this helps~

(I have Scarlet Blaze, too, and Kakashi (combos with everyone), Kabuto (double healing and strongly suggested, though Karin should be fine for you), and Great Ninja War Kiba (who rocks).)

I did a fire main control guide. Should help you out a bit http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=2758&extra=page%3D2

get 3 star sasuke and kakshi with karin
chase 1
mystery 2
standard 1

you can try 3 star sasuke hinata and karin and once you unlock summom you get get 10 one and do a 30 hit combo