It looks like you mostly sell military stuff so to maximize the effectiveness of your links, you'd match the link to the web site content.
For example, if you have a blog about the military in general, you'd link to your storefront. If you write a blog post specifically about the US Army then you'd link to a US Army section or specific US Army product that relates to the blog post.
Include your affiliate ID at the end of the link, like this:
Code:http://www.zazzle.com/las_vegas_strip_sunset_aerial_photo_poster_print-228990890592802093?rf=238382316261240286
(?rf=affiliate number)
Free sites like Hubpages, Qassia, and Squidoo let you write articles about topics and include links to your products. Writing a Hub page about dogs and including links to US Navy products is far less effective than writing a Hub page about the US Navy and including links to US Navy products... although a Hub page about dogs with a link to a US Navy dog shirt might produce a few sales per year.