WORK VISA FOR CARE GIVER

Need practical advise - not a blanket answer.

I am a South African citizen who has received a permanent offer of employment from a private US citizen.
An elderly disabled gentleman requires a live in companion / assistant, and nanny for his two young children. The position includes accommodation, board and lodging.
I have no idea where to start, which VISA is the right one, how long this will take etc.
I need practical help, not just referrals to a website that makes me more confused than actually answers any questions.
The goal is to get me to the States to work for this family on a permanent basis as soon as possible. How do I go about this?
I cant be there 3 months and something goes wrong with my paperwork and I need to leave.
If someone could please address my specific situation, and answers my questions, advise me on a course of action, I would greatly appreciate it.
 
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