Q: If I have an IPhone, IPad, and  Macbool Pro That are all synced do I need one icloud for all three or individual iclouds?

You can use one iCloud account. Though you might need to pay for extra storage if you want to sync lots of documents.

Assuming these are all your personal machines (with no sharing), you should use the same iCloud area to populate each and every machine.  --- One iCloud, as you say.