These are always fun to make. I guesstimate the measurements depending on the size of the sucker. You should cut your cardstock as wide as the sucker (and wrapper), but you should leave about a 1/4" of excess cardstock at the top for the ribbon. Sometimes I fold the top of the wrapper down so I don't punch through it.
Once I have my cardstock cut, I score it in the middle. I then punch a hole in the middle of the score line. (This is where you will push the sucker stick through.) I then take my hole punch and punch 2 holes at the top. (This is where you thread the ribbon through.) To finish the front off, simply embellish as desired. I used my circle and scallop punches. When mass producing, punches make it go really fast.
*Tip: If you don't want to use ribbon and really want to speed the process up, you can simply just staple it shut.This is that it looks like on the inside.