Each State has its own process and requirements.
You should be able to visit State Departments of Health to get basic information on the certification process.
Coming to live and work in America You'll also need things like a work Visa and to meet residency and immigration requirements.
I would suggest seeking out an international exchange program to assist you.
There are various programs for foreign born educational credit, some digging on the internet will get you some info on education equivalency and the processes to obtain it.
Bottom line, whosoever offers you an opinion (myself included) Just remember to research the States, and all your options, chose those that will lead you to happiness and contentment. Good Luck.