Next step is , an interview at the nearest US embassy to where you are located, a medical is required , you will take with you to the interview whatever they ask, certificates , police clearence certificates, all costing money of course , you can find numerous sites on the internet for guidance on these procedures ,we found a good video on You Tube uploaded from a couple that had been through it all , put in a search and I'm sure you will find it.
Good luck for your application
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