You want to sell advertising space of your website?
Because you wrote which are the best free ways to sell your website to people, which means you want to sell your site...
Please clarify it, so it'd be easier to get responses
Free ways to advertise are submitting to web/article directories, social bookmarking, blog commenting, etc.
Make sure your ping list is current, and search for some rss feed directories to post your link at as well. But useful comments on other similar blogs may be most important for traffic.