Become Medicaid/Medicare provider

Hello,
I am new here. I am in the process of planning my own business, either home care (private duty) or care manager (I just became aware of this title; is anyone familiar with it?). I read in an old post that a nurse became a Medicaid/Medicare provider and apparently was able to use those resources as sources of payment. Does anyone know how you become a M/M provider? And, how fast do you get your payments from them?
Thanks