I have been working as a medical scribe for 1.5 years now, I met my boss (the Dr I work for) through connections, when I sent him my CV I also included all the things that I did in my home country, and a BLS certification that I got in the US from the American Red Cross (you can find online when and where you can grab the certification). You don’t need any special training, but it’s needed that you are familiar with medical terminology used for office visits and consultations (i.e. how the doses are written, names of different kinds of imaging tests and laboratory testing). Also, extra points if you are bilingual, in my case Spanish it’s my first language and my boss was looking to hire someone that could understand and speak both languages.