Ollie, I ended up coaching non-competitive co-ed Soccer for about 5 years and even at that I had to have a minimum F license to coach. I ended up with an E and was going to get a D the following year, but my son and daughter gave up the sport and I saw no need. From what I remember with your C license you would be able to coach up to NAIA and possibly Division II NCAA, I know you have to have a minimum B for Division I and an A for the National or Pro. The license classes were extremely helpful to me in setting up practices and learning the different positions on the field. Two day events for the F and E, and I know it was two weekends for the D. I have a friend who is coaching girls competitive right now and his license classes are done on line for the most part with one day of field work. However you really need to know the laws of the game, more so than I had to know. Of course that was about 25 years ago.