Hey Haps,
I work at home using WP5.1--yes, it's a dinosaur, but I have so many macros, my expander, etc., that I couldn't do it faster on another program (even though I have used WordPerfect and Word for Windows in the past). I have a couple of MT friends who are excellent MTs, very computer savvy, know several programs, and still choose to work in WP5.1, so know you are not alone! The only problem I sometimes have is that I have to pull my completed work into Windows to print in certain fonts.
To answer your question, AllieCat's link is a good one to try. I've personally found that HP printers work best with WP5.1. What I did was, since my printer (I have an HP Laserjet 3100 fax/scan/print/copy printer) was not on the list of printers to select in WP5.1, I just started selecting different ones on the list and then did a test page until it worked. The HP laserjet II worked with mine. If you have any other questions, feel free to ask! There aren't many of us WP5.1ers left (but more than you think!).
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kkb (Karyn), who considered herself a newbie after 18 years doing MT and even though she is no longer working in the field, still remembers what it was like to be a newbie!