Question about general admission at house of blues chicago

I got tickets for the "lost treasures" show and since all the tickets are general admission was wondering a few things about the show. I actually was inside the place a few years ago for a few beers but not for a concert.
just a couple of questions
1. how is seating determined? i.e. is it first come first server? i.e. is it good to get there early?
2. is there a bad seat in the house?
Thanks.
just a couple of questions
1. how is seating determined? i.e. is it first come first server? i.e. is it good to get there early?
2. is there a bad seat in the house?
Thanks.