Re: I'm getting my bees
My personal preference would be to wait until you have added the second deep brood box and are adding your first medium super. I attach 3/8" shims to the bottom of the two sides and back of the first super. This creates an upper entrance just above the brood box that allows the bees direct access to the supers without having to navigate through the brood boxes.
There are many others that have opinions on how to create an upper entrance. Try different techniques and see what works best for you and your hives.
“Everything will be all right in the end... if it's not all right then it's not yet the end”