You can just create a guild at lvl 10 with 2 other ppl.
This guild will be lvl 1. At this lvl, 7 other ppl can join.
Now the guild needs to be lvl 2. Then it can have a max. of 30 pol inside.
To reach guild lvl 2, the guild Mist be lvled up (guild points) f. e. through monster hunt quests.