Re: Planes of existence, How many?
Question 1:
As many as you need. In Heinlein's Glory Road, there were an infinity of planes. In LotR, there is only the material world, even if some beings have a spiritual presence also. Literally any natural number lies between these extremes.
Question 2:
Depends on the setting. Technically, you only need two - the material plane full of dungeons and whatever plane Demons get sent to with a Banish spell. Even that could be reduced to just the material plane if you reinterpret the Banish spell to mean demons are dissipated or disolved and recoalesce after a period of time.
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