I started out with baby pictures as requested. Even though she was, naturally, a super-cute baby, they weren't really that interesting or different. So I decided to just pick some of my favorites. It took a long time to pick faves, narrow it down, and then switch them out a few times to make sure they went together. I think it worked though.
Use a photo editing program to crop and adjust your photos so you get just the right size depending on the size and opening of your frame.
Print out pictures in black and white. I had my printed because I wanted a better quality print. Sometimes, I have printed out on regular paper and you can hardly tell the difference once it is under the glass.
To hang, I centered the first one (the center picture) from left to right on the wall. Then, I used a plastic block to mark off how much distance I wanted between the frames by holding it all on the wall. (I didn't want them spaced evenly across the wall; I wanted the whole long rectangle that the five pictures made up to be place evenly across the wall.) My husband has a small level and we used that to make sure the nails were in a straight line.
Pretty simple, but I think it makes a nice statement. And, let me tell you, my daughter was thrilled to see so many pictures of her favorite star!