MailCHimp is pretty dumb in the sense that all it does is send out emails. So you’re going to need to have some place for people to land (even if you don’t call it a landing page) in order to capture their email information and initiate the outgoing email process. I am little murky on the idea of a squeeze page. What is it and how is it different from any other page that a merchant has? but mostly, you seem to be going about this backwards. Design the product, design the page (because the Adword has to send you someplace) – and then if that’s effective, figure out emailing.