Do you have clips or straps or clipless? If not this is going to be a very painful learning experience for you. A lot of people don't realize how important foot retention is if they are coming from SS or geared bikes, which are easy to ride without. Seems like you just wanted to try it out, but plan on a SS. If you do want to ride fixed even occasionally, you should get some clips or something for your build.

I also agree about learning to ride fixed with a brake(s). In fact, I never took mine off. If you ride fixed for a while you will actually feel weird the next time you are on a coasting bike. To me it's a bit like coming out of the ocean after a few hours playing in the waves...........standing still gives you that weird feeling.