Are you asking about being an affiliate for physical products or actually starting up a business selling your own physical goods? If you’re taking about selling physical goods with an affiliate account I would recommend you sign up for a Amazon or a Commission Junction affiliate account. Both are very good. You can also sign up for an eBay affiliate account, but not really sure how that’s done as never done that myself.
You can also still apply many of the same principles that you learn in commission blueprint with these other affiliate sites.