The Sorcerer writes...

Hello, I had a few magic themed questions and hope this doesn't waste your time.
1)In the "worlds" you've created or contributed to, when someone casts a spell, do they always drain their life force to do so or is that only when they don't have an accessible, external source of mystic power?
2)Does draining their life force for power only happens when they can't access/channel magic from somewhere else or can their life force itself act as the necessary energy to fuel their sorcery?
3)If something's life force can fuel sorcery, does that make life force, or vim vitae, a type of mystic energy too?
3a)If vim vitae is an actual type of usable energy for sorcery, do characters like Zatanna usually tap this personal power source because it is technically more easily accessible, if finite?
4)Is one's life force naturally self-renewing? If so, using or draining too much at once would kill its source?
5)Is there a connection to one's stamina and life force? If so can you please explain layman’s term?

(Sorry if each world you've written for has a different answer, and if so please feel free to disregard this post as I don't want to take up too much of your time. In any case, thanks for creating wonderful material that has produced so many fond memories and enjoyable content.)