Originally posted by WalkingEye
Can I use a celestial or solar working to make someone who is a normal Human into a essence user? If so what would their essence pool be like Mist the Eternal Revolutionary essence x10 personal motes? Can I make a familiar animal with a essence pool? If so what level working would that be?
You can't turn humans or animals into generic Essence users, because there isn't any such thing.
If you want to confer supernatural powers on someone or transform them into a magical entity, and you and your Storyteller decide that Charms and a mote pool is a good way to represent that power, that's totally fine.
Edit: What essence do the being you make with a celestial/Solar working start at?
No Essence requirement. A mortal sorcerer can attempt a Solar Circle working.