As a PGY-2, myself, I can't say I know exactly what the attendings and senior residents think. However, it's not that hard to get along just fine in PGY-2. The hard thing is to really stand out in a positive way. And in that regard it's not much different from any other specialty--clinical skills, leadership, management plans, knowledge, attitude. There are a bunch of other threads on reading materials, some new, some old.
Stuff that will be useful to a call component, if you don't know these things already, are assessment of the suicidal patient, management of acute agitation, and learning whatever legal environment you'll be working in.