Farming and Gearing Prioritisation

New returning player here, have a decent Imp Trooper team hitting sub-1000 in Arena and Imperial fleet hitting sub-100 after around 3 months. My current target is farming bounty hunters and Mando toons to build towards Razor Crest (140 shards as of now), Chewie, the Falcon and the Executor (and Jabba way way further down the line). 

Looking for tips on who to prioritise and how to fit in CLS. Thanks!

(ignore the low gear tarkin we'll get to him later down the line)