Welcome to the addiction! Sounds pretty good so far, I avoid lamps because they suck the humidity out of the air but as long as you can keep the humidity about 50-60% its up to you if you want to use it. It is always best to leave them be until they are eating again in their new cage, however taming is rarely and issue with ball pythons and even if he is a little jumpy a gentle tap on the head usually pulls them out of feeding/defensive mode. Most balls you can just reach in and grab them, usually you want to come from behind their head and pick them up by the middle of the body. And IF they are defensive or think its feeding day and are poised to strike 90% of the time a gentle tap with a paper towel roll or something similar will have them turn back into balls at which point you can pick them up without risking a bite.
P.S. be aware a 50g tank may be a little scary to a baby ball. You may want to partion off part of the cage if you have trouble getting him to eat so he feels a little more secure.
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