The summer solos are definitely worth it for you since it will get you a 4 star fighter. You should really only be opening event packs. Don't waste your coins on the 24k pack.
Use gold tokens to get fighters. Hope to pull fighters that can be redeemed for Champions in the "Sets" section.
Do the dailies to get tokens in order to redeem for a wild card. Use those wild cards to get the champions as well.
The moves will come over time by just opening event packs.
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