Is it possible for Americans to get work in Europe?

I am from the States but I would like to live with a Czech friend in Prague. However, I would need to work in Prague in order to live there. From what I've been told is that Americans need visas in order to obtain a job in Europe, but I need some more details on that. I am 20 years old and I am not attending college at the moment and probably won't be until after I would live in Prague. Is there anyway I can maybe serve food at a restaurant or a some paycheck to paycheck job like that? And if so, what is the process I would have to take to do so? I appreciate any advice you can give me.