New rebel player, got the core set minus one tie squadron that my grandma stepped on :'(

Any suggestions for what to buy next ?

Welcome to this amazing game! Let me refer you to @Snipafist and @geek19‘s Blog- they have the exact info you are looking for, and SO MUCH MORE!!!

http://cannotgetyourshipout.blogspot.com/2017/03/building-fleet-for-cheap-2-rebel.html?m=1

ultimatley it comes down to playstyle though. Do you want to kite at long range and harass the enemy? Grab a few cr90’s and an assault frigate. Do you want a swarm of lethal ships that get up close and personal? Mc30’s are your friend. Want to throw fistfuls of red dice? Buy Home one with ackbar and add in any of the above mentioned ships. Squadron play suit your fancy? Get both rebel squad packs, rogues and villains, and either a frigate or pelta to push them. Second nebulon-b for the much hated Yavaris title would be a good purchase as well

A replacement tie squadron.

MC30s sure are fun however.