If you are familiar with guilds warhammer and fellowships from other games, you won't really be surprised in Warhammer.
You will need a full group of six unguilded members to travel with you to Inevitable City and visit the warhammer guild registrar where the group leader pays the "small" fee and creates the guild. The exact fee may change when the game goes live so look it up if you aren't sure you have enough.
The guild tab will provide lots of useful information about your war guild. The Profile tab lists announcements, events and web page information. The Calendar page is also a cool feature and allows events to be scheduled and shared with everyone online. No more relying on outside websites for event scheduling. The Roster lists your guild members levels, class, race, etc and even their location and last login. The Standard page is for editing and displaying the guild banner. The Rewards tab shows the guild's rank and progress, as well as rewards for achieving the next rank, and so on. At this time, the guild level is capped at level 40, just like player rank.Your Warhammer guild will level up and gain skills, abilities, and rewards. Your guild is leveled up as player members gain renown points. At guild level 4, you are able to join an alliance. As your guild levels, you will gain access to guild tactics, banners, and guild bank slots. Guild banners can be displayed on guild members' cloaks, or on keeps that are being defended.