hey DunkMujunk, welcome back to the game :)
i always say farm a team you personally enjoy playing with / have fun using, or one that helps you be competitive or earn crystals
ahnaldt101 and cubsfanhan can give you good videos on who the top teams are right now. (ahnaldt101 also does videos for players with new accounts that are helpful). i think one of the "lowest investment / highest value" competitive teams you can farm early on in the game (meaning you don't need legendary characters to unlock) is Darth Revan.
also there's a new "journey guide" in the game under Objectives, click on that and then navigate the tabs at the top to journey guide. that will give you a helpful idea of who you need to farm in order to unlock different legendary and heroic characters.
hope that helps a little and good luck!
