New player

Based on what you have right now, i would suggest you use and develop this team for light side battles: Ackbar (leader), old ben, princess leia, lando and luminara (or ewok elder in stead of luminara), good beginner team.

Then this team for dark side battles: Dooku (leader), royal guard (one of the best dark side tanks in the game, he has saved my arena team very often), vader, boba fett and talia (old daka is much better to use than talia, but you do not have her).

I suggest that you start farming the phoenix squad and a credit heist team right away, because they will help your overall progression in the game and help you to obtain many important characters as well as help you to obtain resources to upgrade them.

My suggested credit heist team: boba fett (leader), stormtrooper han, lando, cad bane and IG-88. They are all easy and quick to farm. The phoenix squad members that are easy for you to farm are: Hera (leader), kanan, chopper, ezra and zeb. Sabine will take more time for you to farm, because she can only be found in the guild store, before you farm her farm captain rex asap, he is great for many areas in the game.

The team that is more likely to help you farm the ones i have suggested in cantina battles, is probably the first one for light side battles. But remember this, make sure to farm gear, gear is important because a 5 star gear level 9-10 character is as strong as a 7 star gear level 7 character. And daily activities rewards will help you.

thanks man ! ;)