Guilds are associations of players. Guilds can be found by a single player during the early access. This player is then the guilds principal. The principal can accept new members to the guild, determine the guilds name and write a short description about the guild, which can be seen by other users. In game you can use a separate chat channel as a member of a guild.
If you want a to have your guild section here in the forums, ask one of the administrators.