The checkout process I have in mind is very simple as I am only selling a single product:
1) optin page from my current landing page (which captures shipping information)
2) checkout page. The check defaults to shipping address = billing address if the box left checked. (so no addresses are shown since the information was captured on the previous page) Otherwise unchecking the box pops up billing address fields. Credit card fields are always shown.
3) Thank you page
I have uploaded snapshots of the optin box and checkout page so you can visualize the entire checkout process. Remember: you do not make the optin box but you do make the checkout page(and a full PSD file will be given). The optin just needs to be connected to the checkout.
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I am looking for an ongoing relationship as I plan to add upsells in the future, as well as look for further ways to streamline the order process.