Basically, you'll need your own product to do a JV with someone. If you have your own product you can offer the list owner a percentage of sales. A list owner doesn't want to send out a link that only you and the merchant is going to profit from

In your situation you may want to look into ezine advertising where you pay the owner of the list up-front to send out your ad (which could be an affiliate link)

You need to find a relevant product that converts well, and have the ability to write relevant ads that pull traffic - and find appropriate ezines to advertise in. However, it sounds like you're just starting out and you will probably benefit from educating yourself about Internet Marketing, and most important of all, get clear on what it is you really want to achieve.