Tracy,
I probably make about 7 maybe. How I do them for best results are, I section out the amount of hair for one, lets say I'm doing my bang (I have somewhat long bangs), and starting at the ends I use my two index fingers and roll them up winding the hair like an invisible roller. When I get to my scalp I rotate the curl so that the hole is sideways flat against my head, and I slip one bobby pin through and move on to the next section.
So, I put about one or two in my bang area, one on the front side of my right ear, one on the front side of the left ear. In the back, I do about 4, two or so at the top and 2 or so at the bottom, I use different techniques based on how I want it to look. Sometimes I have all of the curls go in the same direction, meaning when I rotate it to pin in place they all may face right or left, or the right side of my head will have them facing the right and the left facing the left.
I get curls, sometimes it's curlier than other times. If the hole is too small I spread it some before placing the pin to make the curl a little bigger.
I hope this makes sense.