Returning player

Hello. I played at launch and thought I’d remember how to play given I played a lot then.

Rest assured I absolutely don’t.

I got through a ton of red dots and pop ups and picked archer and also picked him for the free relics I think?

Last time I played was just to redeem the free dr ratio. Didn’t play then really. I completed like the first 2 chapters or whatever they are called I think?

Basically idk what I’m supposed to do. I’m at hertas space station and also I think I can get 2 free supports? It’s having me choose between 3 sets of 2 supports.

Also noticed my hp isn’t full on my characters so I’d like to know how to heal them without items.