When you have his tank all set up, proper heat and humidity, with 2 identical hides, you give the snake 2 weeks of alone time.
These 2 weeks will ensure that your new baby is acclimated to his environment, and that is when you should offer him a fuzzy mouse. Only handle him when it is absolutely necessary, for cleaning any really messy pee etc.
With that in mind, he should be well on his way to being a great feeder. 90% of the time a snake does not eat is because of his husbandry, and STRESS.