I understand now accept for the checkbox. Should I check the box "Include shipping fields on the checkout page"? I want it to show my current shipping rule on the checkout page, but not generate new ones. Does this matter?
As for the PayPal Standard, just for the record, in my case I have some extensive IPNs that trigger a few different things to happen so that's why I was trying to go that route. I'm sure that once I figure out the Express Checkout, it will offer me those same tools that I had to build into my IPNs (update database after confirmation, send out emails, etc.).