I recently rescued a 1 year old Lesser BP named Henry who's been cared for miserably, and he's my first snake ever. I've only had him 24 hours and I'm terrified that I will never know what I'm doing. He's in a kind of makeshift tank from his old owners right now so I know whatever I give him will be better, but it doesn't seem like I will ever do it right after reading the caresheet and setup guide on here. For starters, he's tiny and in a 29 gallon tank, which is way too big, right? But he came with it... he has a heat lamp and that's about it. Here's what else I got him:

under tank heater
double dome lamp fixture
daylight bulb 60 w
nighttime bulb 60 w
repti-bark bedding
a bit of moss bedding

ehh, and a bunch of other things, but those seem to be the big ones. I forgot a thermostat, though! So now I have to get that. And I didn't know to get the fancy thermometers/hygrometers so I got these. It's like, wow, if I did that, what else did I do wrong?! (And never mind the cost of replacing his thermometers and getting a thermostat on a student budget, ugh.)

What if I never figure it out? He's been abused, he deserves the best life possible, and his mom can't even remember that he needs a thermostat, let alone how to use one. And none of it's even been shipped yet. And, and, and. I have raised horses, I've had aquariums, and nothing's freaked me out more than setting up a ball python tank.

Is this normal, or am I just unfit to have a BP? It seems like you guys know how to do everything and I freeze just trying to pick out a water dish. OH, AND? Some people say NOT to get an under tank heater and some people say not to get a heat lamp and use an uth instead and some people say use both and WHO IS RIGHT? WHO DO I TRUST? AGHHHH.