You can send PPC traffic to a site that has multiple pages and in fact having a complete site as long as it's all related to the same topic can help a lot with your Adwords quality score, which keeps your cost down.
But PPC traffic you want to send to a landing page that's very specific to what you are trying to sell and that page most say should not have all the navigation links and stuff, just content that gives the visitor enough info or presell to get them to click through to the merchant to buy. Several articles here about landing page design if you aren't sure about that.
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Your Partner in Success,
Linda Buquet :: Affiliate Program Advertising, Promotion & PR (Publisher Relations)
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Get lots of content on your site like Linda said and go for a landing page. It'll really boost your QS and you'd pay far less than you'd normally do. I've been doing this for a health niche and by far its going great....but let me tell its WAYYY competitive niche..and I had to blast my *** off to get it done