Really!
Unless you have a team of players from previous games or real-life...I do not recomend it.
Everybidy wants theire own gang I know, but there are SO MANY guilds outthere.
I suggest trying to find an established guild outthere to join.
In fact would it not be interesting to CAP the number of guilds per server?
Or perhaps make alliances a part of the game mechanics.
Perhaps there could be 3-5 factions or something per server that guilds would join...that would be neat too.
Just some thoughts...