Hello Ian,
If you were an affiliate of another merchant through our system that is how things would work, but you would have to get in touch with the merchants you want to work with. They all have their own varying terms and conditions, but our system would be able to track the sales you refer to them and keep both you and the merchant advised of the percentage you've earned, although each merchant would be responsible for paying you.
You can search through our marketplace to find some merchants who are taking on new affiliates through their product pages. Many other merchants solicit affiliates directly from their own websites.