Here is a small collection of Pathfinders books. These are what I feel are the basic starters kit for both players and GMs..
included:
Core Rulebook
GM Guide
Advanced players guide
Pazio published Map-Packs (I also included the torrent file to my Dungeon Tiles incase you want more and trust me, you'll want more)
Bestiary I and II ( there are 4, but for now 2 will do)
NPC Codex (for help with creating NPCs, and encounters with humanoids)