DIY invite question

I have regular old 8 1/2' X 11' cardstock (or whatever regular paper size), and I want to print (4) 4'x6' invites per page.
Does anyone have any helpful instructions? I tried on my own, in Microsoft Word...
TIA!

I may be doing my math completely wrong, but I don't think that it's possible to do 4 4x6 postcards. Take a look at Avery's site, you can download a free template to use in Word.

4 x 6 Template