First, the vitals:

Finale v25.40.259
iMac (late 2017)
Mac OS 10.13.3
Printing to Sharp MX-M654N

Issue: I am trying to print parts directly from Finale (not from ,pdf).

I am trying to print individual parts from a Finale file, as stapled booklets. 

The printed size if 8.5" x 11", printed as a booklet on 11x17 paper, folded and stapled. In the past, I have had no trouble doing this using the booklet option in the printer features dialog box (not in the Finale Options itself). This has of course meant that printer itself has a booklet/duplex feature installed. I have never needed to use the finalescript to generate the booklet.

But I haven't done this for several years, and several things have changed: 1.) A much newer version of Finale (I used to do this in Finale 2010); a new operating system (last time was like 10.7); and a new copier (shared in a large school of music) with somewhat less intuitive booklet printing features.

In this new environment, I'm failing. I could use some advice. Please keep in mind these details. The individual page size is 8.5" by 11".

1.) In the Page Setup dialog, as the FORMATTED pages are each 8.5" x 11", should I set the options to Ledger/Landscape, or keep it as Letter/Portrait? 

2.) Anything I need to do in the Finale Print Options dialog? Fit to page? 1-up, 2-up. etc?

3.) Anything further?

I would be most appreciative of any assistance.