Mine is tri-fold, Z-style folded (like an accordion). The backside has just my company logo printed. I am constantly printing these because I use them for unaddressed ad-mail, they are my #1 piece of "initial" marketing material, and I have them printed on fluorescent orange paper.
Did it myself, but I know how to do a lot of stuff myself and I prefer it that way. The recommended way would be to go to a graphic designer if you don't think you could create something you'd be happy with, but I would be such a pain in the behind to any designer that I would hire because I'm so picky they would probably give up.