If he's underfed to begin with, don't go too big off the get-go. REALLY don't want any regurges right now. In my opinion, it is better to go a little smaller than a little larger. Feed a rat that is about the same width or a little less than the widest part of the snake's body. No more. I would also feed every 7 days myself, but perhaps others who have rescued ball pythons can chime in with their own experience!
Keep an eye on the things you've mentioned. Was it specifically a herp/reptile vet you went to??
Also, don't forget about a UTH with thermostat!! That should be included in the "bare minimum" - belly heat is essential.
All the best, and looking forward to photos and updates!
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