Back when I fed barf, it was easy. But with current research after research finding no real benefits, plus contamination risks with my liver, I was not sad to stop when Cara proved that she could not tolerate even a wing or well anything.
So I looked at actual nutritionists info on what and how to feed homemade. Once my head quit spinning and my eyes refocused, I paid hommage to those who can manage it and moved on. So I'm no help, but good luck.
For feeding amount, start with bowl down at most 15 minutes. If the pup gains right, you're set. If too fat or too thin, adjust the amount. While folks can give you estimates, their metabolism, activity level etc are not the same.
My adult 24 pound basenji loved food and would gain weight smelling it. My 23 pounder felt eating was a waste of time, but I could hand feed her double the amt her poor niece ate. So watch for a tuck from overhead and get periodic bloodwork to make sure no deficiencies..