Well, fir have to start by getting an EMT-B. This is the basic EMT license that you will start to work with. Once you complete that, you can become and EMT-P (paramedic), but thats another story.

Dor you EMT-B, you need to take a 1 semester course at any community college or university. Then, upon completion, you take "the national registry" examination. Once you pass this, you are certified to work in the USA as an EMT-B.

There is more paperwork to get licensed in your county, but to my understanding there is no additional test requirements, just registering.

Hope that helps!