Basically you pick a summoner first, then you choose the Monsters that summoner can summon to make your team. There's a Practice button so do that first before you do Ranked battles.
@clove71 is one of the best players and she has videos on her blog so you can check them out. Any questions, just let me know and I'll try to answer them!
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Thanks Kenny ^^ I will check @clove71's blog . I'll have time to to battle tomorrow . Thanks again .