What do I do after I take the motorcycle training course? (CA)?

You will only have to take the written test. If you were paying attention during your MSF course I wouldn't worry about having to study. A lot of common sense questions. I didn't study or take a MSF course and I passed it without missing one question. The only thing that I thought was odd, is that they also made me take one half of the written test for driving a car as well as the motorcycle test. But I was 28 when I took the motorcycle written test and my license was coming up for renewal so that might be why I had to take one half of the automotive written test again.