Even though I'm not modding and I'm on xbox I thought posting here would be best since modders are experts at all the technical stuff. I read up on cells because I would like to make sure an essential follower(Erandur) gets to his maximum level.

There is a quest right outside of Dawnstar (Kyne's Trials) that I would like to complete as quick s possible but I'm still around level 25. Will going there 'create' Erandur at level 25 because its close to the inn he appears at or does he get created when i actually enter the inn. How big is a cell? Are the ruins outside Dawnstar within the dawnstar cell? I haven't fully understood yet.

An exterior cell is 4096x4096 game units, or roughly 100x100 ft.

An interior cell doesn't exactly have a designated size. Any time you go through a loading screen into an interior, you are loading into a new cell. Some are very small. (A small house in Riverwood) And some are very large. (A lot of dungeons have very large interior cells)

Thanx. So Erandur won't get created until I enter the inn then.