Do you mean size or type of food? As for size there was a very good chart posted on one of your other threads that is good for size. Another way sense I seem to remember you saying you don't have a scale is to get a piece of string and gently wrap it around the biggest part of his body then use that as a reference on what size prey to get.
For what type of he was on mice before I would personally feed him mice for the first few feeding them switch over to rats after he gets comfortable. Also if I were you I would feed him every 5 days instead of 7 until he gets a little weight on him, but that's all up to you.
Also don't be sorry! It's good that you are trying to do your best and learn. We are happy to help
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Okay, so, do you have a suggestive size though?
Either the guy didn't feed him or Axel didn't eat thursday.
So, should I feed him the Pinkies now or get more food before I feed him?