I'd strongly recommend deciding on your approach for proxying cards that come in other packs early on.
My group never discussed it, and now we have spent hundreds of pounds and have ships and cards that have never even seen the table.
I regret nothing, but the hobby could have been a lot cheaper for us.
I started with Most Wanted and a Hounds Tooth. We then got 2 TFA sets and 2 original between 4 of us. Rebels split the Rebels, Imperial Guy took most of the Ties. I got some dice and a damage deck. Hmmm....