A Quick Question

[Parsimony]

Hello, I plan on purchasing an IJ Jag from a local breeder, he is currently fairly small. I have read and done the research I need to successfully keep a carpet python and understand the husbandry.

My questions are more of how to heat an enclosure and tank size. Would it be better to use a lamp to provide a basking spot on a perch in the day, and a UTH for night time temperature?

And would it be better the setup a large enclosure for him to grow into or start him in a smaller setup for less stress?

Thanks in advance!