What do you need? In practical terms, a Squad Arena team that can secure decent rewards. Depending on whether your guild needs/requires it, at least one squad that can do well in raids (or ideally, excel in at least one part of raids where there's some slack that needs picking up). And some pilots who can beat the Fleet Challenge that awards Zeta materials.
If you have any resources left that you want to spend beyond what the aforementioned will consume, then dedicate it to alternate squads who strike a balance between "I like these characters" and "these characters are effective," or to the pursuit Legendary Event characters. While Yoda for example is a cool character in the movies, simply having him doesn't do a ton of good for a player who isn't serious about Jedi squads.