I'm not sure what the req for guild creation was, I think it was 100,000 gold but it may change in open beta. At level 25 I had 300,000 gold.
There wasn't much PvP going on during closed beta except for duels. I played on the PvE server so I can't comment on open world PvP. They will be implementing guild vs. guild, arenas, and server vs. server.