Get yourself updated with the latest release, and while you are at the page, look for the links that will lead you to the affiliate page.
Most of these releases are mostly clickbank stuff, so you just need to plug in your nickname id and you have a ready product to promote.
Else, you can always go to the marketplace and search for the products that you are keen in (use keywords that you know well in your niche) then sort by Highest Gravity - this will give you a good gauge how popular the item is, then see how much the payout is like.
If you are going to use PPC ads to promote your items, it will be good that the products pay well to cover the PPC cost and to get a hefty profit.