you've got a few alternatives, sure you can just add the article to your product page, though I would only do this if it's not too long - nothing to do with SEO, just personal preferences as I don't like product pages with too much text.
Alternatively, you can get an account at blogger or wordpress.com and use that to post those articles, linking to your products and from there to the article.
Or, if your current ecommerce script isn't up to the task, install wordpress.org in a subdomain or subfolder, customise it the way you want and do the same as above. With some php magic you can automatically link the two together or do it manually.
If you go with either of the above alternatives, you should start utilising the full power of blogging, i.e. building relationships with like-minded bloggers and those that share your target audience.