Whats a good site to sell ad space on a website ?

I don’t know what your blog is about but I used to have a job where all I did was search blog directories like this and this for blogs relating to what the company did. I made a spread sheet of my findings everyday and then someone else would contact the owner of the blog and make them an offer. They preferred blogs that used hyperlinks rather than banners so it looked like they weren’t paying someone to mention them, even though they were.

Anyway, maybe try adding your blog to a few directory websites and see if anyone hits you up there.

Otherwise I don’t know, good luck!