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Affiliate programs are designed to get traffic and sales, not improve search engine ranking. The affiliate generally redirects the link through their own domain with a meta refresh, pretty links or some other method to cloak and protect their affiliate information to ensure they get credit for the referral.

You can give them the code like I have done here http://www.associatemelody.com/link.html

You would use html code similar to this:

Hope this helps,

Melody

I'm no expert but I do know you want to optimize each page for it's own unique keyword. Each page could be optimized for a separate variation of your main keyword and/or related keywords.

I'm no expert but I don't believe the company's address must be in the footer of every single page. Someone with more experience will surely respond to clarify this.  It might help for local SEO and probably couldn't hurt.

It is quite common for this information to be included on the about and/or contact us pages.

Looking forward to hear what others have to say.