After you created a guild, you need to upgrade it to unlock more features. To upgrade a guild, you need to up your leadership skill level.

There are 5 Leadership skill level :
Level 1 - need 50,000 Skill Points
Level 2 - need 100,000 Skill Points
Level 3 - need 500,000 Skill Points
Level 4 - need 500,000 Skill Points
Level 5 - need 1,000,000 Skill Points

You can upgrade your guild until 5 levels. Each level has different guild function as follow,

Level 1 guild - Can invite up to 9 people to join your guild. Can participate in Siege war but cannot control a town.

Level 2 guild - Can assign a vice guildmaster position to a member for help to recruit people. Can invite up to 14 people maximun to join.

Level 3 guild - Can start to declare guild war and enter Guild Tournament. Can upload guild logo. Can use Guild Bank. Can invite up to 19 people to join.

Level 4 guild - Can enter Siege war when another guild (level 5 guild) in the Alliance enters Siege war but you cannot choose sides in siege War. Can invite up to 24 people to join.

Level 5 guild - Guild will be called "Country". Can now make an Alliance to ally other guilds. Can control a Town if win the Siege War at your base Town (eg. Your base is in Lo Yang, you can control Lo Yang if win the Siege war there). Can assign a Guild Elder position to help recruit people. Can recruit up to 29 people.

Before upgrading a guild, the following requirement need to be fulfilled,

Level 2 - leadership level 2, 100,000 gold
Level 3 - leadership level 3, 300,000 gold
Level 4 - leadership level 4, 500,000 gold
Level 5 - MUST be level 40 Hua Jin or Zi Mo 1st, leadership lv 5, 1,000,000 gold