What fedex paper to use for toner transfer
I normally use magazine paper (thank you, old Nat Geo subscription). The key is that there needs to be some kind of emulsion on the page that can separate from the paper. Some people recommend using photo paper, though I haven't tried it.

The issue I'd see is it would be more difficult to get another print quickly if you screw something up (wrong orientation, missed a component, etc.)

From the options provided on the FedEx Office site, the only one that looks like it might work is Gloss Text.