RESEARCH THE PROGRAMS. With the help of FREIDA online, find all the hospitals and institutions in various states of the US that provide residency positions in the field (s) of your intended training. You may identify any number of institutions with a residency program in the field(s) of your interest. Some candidates will chose at least one field from an alternate allied specialty as a back up, e.g. also apply to family medicine programs with the main interest in internal medicine. Email all the programs of interest and ask about whatever information about the program requirements you need. It is wise to inform your situation and to pointedly ask about the visa, educational, research, and US clinical experience requirements.
US Clinical Experience (USCE) is helpful in strengthening your applications. Programs ask for at least 4 weeks of such experience, some will ask for a 1-year experience. Many programs give preference to candidates having USCE, many others have a mandatory requirement for it. Most programs will not accept observerships which allow an FMG a spectator status. You can find about externships or active voluntary participation at a hospital near you or where your relatives live. Most useful USCE is a residency done at an accredited US hospital. These are usually people who have finished a 1-year preliminary or transitional residency from a US hospital. Yes! People do that to get USCE. It is difficult to volunteer and support yourself unless you have close family members in the US. You need to contact individual hospitals for opportunities for USCE.
Programs have very diverse application requirements that may change every year or may be rigid as a rock forever. Mostly programs send out a stereotyped information sheet giving most details, some give out information in a personal manner as asked, some altogether ignore your specific queries and yet others will ask you to visit their web page. Some programs will chose not to respond at all. I must tell you here that I received a response from a program saying they only considered candidates who were related to their faculty. Never heard that one before in my life!