How does one receive training for ultralights if they can only carry one person? Wouldn't the characteristics of an ultralight make transitioning from a heavier, two-person aircraft tricky?
EAA has some good material on ultralight training. You can check it out here.
Be sure to find a source or instructor aware of “Low Mass / High Drag” flight characteristics. If you lose an engine, you may have to point down at a steep angle, immediately.
There are two seat “fat ultralights” that are now registered as Light Sport.
I've trained people in a couple. But also turned down several due to unsafe engines.