Find sites in your preferred niche and email them for opportunity to guest post.

Anyone that is willing will give you their criteria.

Sanjuk61,

If you are looking for a guest posting network, PostRunner - Speedy, Unique, and Free Website Content for WordPress Bloggers is a viable option, but your site has to be good quality. Also, the content on the sites are all monitored independent, which provide a much better option than most networks.

Hope this helps,

Shawn