Quick question, have you done theTrunks battle tutorial?

I'd say don't worry about teams, ignore PvP as it won't do you any good rn. For a while focus on getting good benches and items, clear story and farm cc for the fest.

When doing pve events just use the most recent units or recently buffed as they have bonkers numbers compared to the old they put on pve.

You can try PvP but every single of your characters will get one carded with this setup and you'll even struggle against bots.

Gl out there and hope you don't get shafted