Honestly, 12 affiliates isn't very many, as most of your referral results would come from a minority of affiliates (related to the "Pareto Principle"), so it's in your interest to recruit as many affiliates as possible.
If you have a Web site of your own, make sure you are promoting your affiliate program and posting your affiliate sign-up link prominently on your site, since interested and satisfied customers would be among those likely to recommend and promote your product.
If you don't have a Web site of your own, you may want to look into having that done; if you'd want to hire some help for that, we can recommend the competent, E-junkie-experienced developers listed in our directory here:
http://www.e-junkie.com/ej/developer-directory.htm
You may also want to search Google for "online marketing forum" to find sites such as http://www.warriorforum.com/ where you could get advice about advertising and promoting your products online more effectively.
