* I froze mine overnight, but you may not need as long. 1-2 hours I'm sure would suffice. I simply had no time to roll mine in chocolate that day! If you do leave them overnight, covering them would be best.
* I used a gluten free oreo cookie package which had 21 oreos in the package, if you use real Oreos, the package contains more cookies. You can count out 21, or simply use the whole package you just may need to add additional peanut butter to your taste and desired consistency.
*You could use candy dipping tools, but I found a fork and toothpick works fine if you are in a pinch.