Get adverts on my website?

I made this website ages ago for layout for this internet game howrse, and I just looked at it and it's getting about 3,300 hits a week and I was wondering if I could earn some money from adverts. I made it with yola and made a free site, could I buy the domain and get adverts, about how much would I get, would it be worth it? Can i do it with yola or would i have to move it? and could i move the site easily?