Well, I tried to create the .mobi file by dragging/dropping the .opf file onto the terminal with Kindlegen. It put me through a few rounds of errors, but I sorted them out and now it's functioning. It starts where I want it to start, and the Cover, TOC and NCX TOC buttons all work as expected.
It did say my cover is too small, however. So I'll have to fix that.
So far so good, thanks to your help ATDrake. Thanks so much!
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