becoming a nanny

I have been in childcare for a couple years now and I'm wanting to become a nanny but I'm not really sure how? I've been offered but that was a while back, 
Do I need certain qualifications? How do I get my name out there? I have qualifications but idk if I'll need more in order to become an at home nanny. I don't have any kids of my own, I would be free all hours of the week. 

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