Get your husbandry corrected, give him a week or two - then try and feed.
Also, get a gram scale to weigh your snake. If the store was feeding hopper mice then he has been being underfed - hoppers are really only for right out of the egg babies. He needs to eat prey that is 10-15% of his body weight. So if he is 100g then he needs a 10 -15g meal. This is either best achieved through rat pups or adult mice. In the long run rats are more nutritious and you only have to feed one - an adult male would need to eat several mice at a feeding.
If you have difficultly getting humidity up, then at least offer a third hide on the warm side that has moist sphagnum moss in it. This will give him somewhere to go when he needs to shed.
This is a great place to learn and help your little snoot grow successfully. Don't worry too much about mistakes made now, they are resilient creatures and you've got 20+ years of bonding time.
No cage is too large - nature is the best template - a snoot can't be booped too much
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