I have added page numbers to my facing pages document and then changed the order to begin on the 4th page at "page 1". Now, I can't get the spread of the first two numbered pages to export as a two-page pdf. InDesign insists on including the first three non numbered pages. What am I doing wrong?
If product is being printed on a high-end laser printer, it may have built in impostion settings. Then you don't have to do anything special to your InDesign file.
You can use the File > Print Booklet option to impose your document to a printer directly.
You can set the InDesign document up as so using the "Allow Spread to Shuffle" settings and the numbering/section options in the Pages panel (I've attached the sample ID file). The numbers you see are automatic page number; you could then print as spreads.