Well, it's just a typical guild system in pretty much any MMO:
1. Rank system-
Different rank have different authority/access right.
2. Public Announcement-
Daily message/objective that administrator-ranking members can access to edit/publish for the members of the guild.
3. Guild Storage-
Items shared around, I suppose materials would be a good start, and obviously credits can be deposited, too. Of course, access right has to be granted before access different levels of the storage.
4. Guild Chat-
Chatting between members of the guild that is currently online.
5. Guild member tab in the communication panel-
Easy access to communicating/wing up with members of the guild.
6. Guild tag-
Issued to distinguish themselves.
Then just go from there, these are pretty much the basics.
For the advance stuff, if applicable, create things like guild missions/guild base/starport. Then there's base building, territorial warfare, tag decal uploading, blah blah blah.
FD can probably even monetize off from this...
These features are pretty common in any MMO, how many of these should be implemented is up to FD.