Need help converting about 5K Word docs to pdf's, 2 pages per sheet

You can view pdfs in Acrobat and reader as spread pages, If you want to have 2 pages on a single page, I would place the single page pdf into a double wide InDesign file and export a new pdf, do this once, then re-link for the other documents (assuming they are all the same page count). If you are trying to produce "printer's spreads" you can print to booklet from Acrobat, if you are sending this to a commercial printer, send them single pages and they will handle the imposition.