Where to advertise

How can I advertise to get companies to post their banners on my web site?

Mmmm you don't need to advertise your free spots, you have to rank well and they will contact you.
No one is going to advertise if your site is not visible in G

post regular articles related to subject that your sites is based on.And do seo work and do regular search engine submission whenever you post a new article.promote your site using free and effective ways.you browse white hat seo section to learn ways to promote your site.also use advanced search box in this forum by typing advertising ,blog advertising and marketing using different keywords you will get different results.read them and apply them.By using these tricks your site rank will improve and advertisers will come to post ads on your site.to find advertisers one example is adbrite.com
Keep working hard and be patient you will succeed.Good luck..

Your website/blog should be of a good design too

or you can sell them to companies that usually deal traffic

Thanks all for your help!