How to Print a Booklet with InDesign
A booklet means that both sides of each page are printed, and typically, there are two pages on each sheet of paper, as seen in saddle-stitch brochures, which are folded and stapled on the fold.
Your InDesign document
The number of pages of your document must be divisible by 4.
Then go to -> file -> Print Booklet.
Setup of the booklet
Select 2-up Saddle Stitch.
Then go to Print Settings
Configure the printer
Select the printer you want your booklet to be printed on.
Then be sure to check the box -> Print Blank Pages.
Setup the format
Pick your paper size and orientation.
Then adjust the scale as you wish.
Be sure to select -> Page Position -> Centred. So your double side's will match.
Once done, you can go to -> Printer and make your booklet ready for printing.