Our margin is set at 65-characters per line. We offer two sponsorships per issue, one before and one after the first article. You can find full information and demographic information on our readers online. We have a few spots still open in the next few months, though spaces are filling up fast. I've recommended doing so for months.
Full instructions are on the site.
We're using Commission Junction because they do all the administrative work of running the program. But if you want to save some money and do it all yourself, then check out AffiliateZone's software especially designed to make administration easy. So we're trying an experiment. When you're stuck, it's sometimes helpful to talk it through with someone who has had some experience. One of the services I provide is telephone consulting .