Look for the printer properties dialogue. Instead of directly saying "double sided", you might see the word "duplex".
https://en.wikipedia.org/wiki/Duplex_printing

If your printer doesn't support that, then I forget whose post already did a great job of describing the somewhat PITA "all one side, then put the pages back in the printer to do the other sides" approach. If you try this, I strongly suggest that you practice with just a few pages until you get it figured out. I always seem to waste some sheets before I get my head straight w.r.t. what the printer is going to do.

Another thing you might consider doing is to change the default print quality to "high". Prints slower, maybe uses a little more ink (?), but for looking at some of the smaller details on a printed map, you want every bit of resolution that you can get, and particularly sometimes fairly small words written on a map.

Finally, another useful thing for this task is a "guillotine" style paper cutter --- you know, a flat board with a sharp blade along one side of it on a single pin hinge. These can be obtained fairly inexpensively and they even have some that are fairly compact to store. Very useful I find to trim off excess paper. Yes, if you're carrying a big enough load of paper this can even translate to some modest weight savings, but primarily I do it so that 8-1/2 x 11 inch sheets of paper will fit nicely into a gallon ziplock.
I think my wife looked a bit askance when I got one of these, but now it sits in her workroom, as she uses it if anything more than I do for other projects.
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Brian Lewis
http://postholer.com/brianle