Through what agency can I be paid as live in caretaker for disabled friend?

What kind of disability?

What kind of care does your friend need?

Who is in charge of your friend's money? - income, savings, social security benefits etc.

Why would you be the best choice of person for this job?

It's not impossible that you might be able to paid to be your friend's caregiver but anyone helping you will need much more information.

Hi, Nunya. Is your friend on Medicaid? I see that Nevada does have some sort of program in which people on Medicaid who need caregiving can arrange for a person of their choosing to be paid to caregive:

https://www.payingforseniorcare.com/medicaid-waivers/nv-personal-care-services.html

That might be a good place to start investigating if there is any way to be paid for the services you're providing.

I hope there is something for you and your friend.