Old player coming back to game, where do I start with squad building?

Worth adding SLKR will also get you that FO fleet, just don’t forget to aim early for the Finaliser in that farm. People sometimes forget about his ship requirements. If you do aim at SLKR then also farm the Tie Echelon and Special Forces Tie Fighter to get the most from the fleet.

SUMMARY
BHs —> 7 star Chewie + MFalc —> Chewpio farm = CLS team
Padme team —> then look at GAS unlock. (He needs 501st clones to shine)
First Order team + ships —> SLKR

SHIPS
Better guild —> GET1 and GET2
Pick Malevolence or Negotiator and farm it with GET2
Meantime H1 Rebels + look at Kyle Katarn and his ship. Check out the video for how these seemingly poor Rebel characters are no longer poor. Boosted by Mon Mothma, Admiral Raddus and Admiral Ackbar (with his omicron).