When I decided I wanted to send out a brochure I searched long and hard on this forum for a template I could use and couldn't find one for the life of me!
*TIP - if you come across something you like on this forum, bookmark it! I didn't and had such a hard time finding those same things again!*
Anyhoo - I finally took matters into my own hands and googled "how to make a brochure in Microsoft Word" and came across this website:
Use Word to Create a Tri-Fold Brochure
It was super easy to do. Hope this is useful for you!