Ready for another??

[Kera]

Alright. Some of you know I'm soon to be getting a Cali King (black and white aberrant from BHB) soon and I just wanted to make a new thread for input on what i should or shouldn't have for it. I had another thread that I kind of posted this in but I decided to make just one thread for it. What I have:
7 gal. plastic tub (15 1/4 inch holes drilled. It has been previously used for snakes)
Aspen for substrate
One water dish
5 hides
I may have missed something...I'll think about it.

What I'm getting in the mail:
ZooMed UTH for 5 gallon tank (4"x5")

I actually need help on what I should get for a thermostat. Do the cheaper ones work fine or am I going to have to spend some more money for that? Also, do I need a bulb source of light or can I just not use a bulb? I have one if it's needed. And is a 4"x5" too small? The tub is 23x17x6 (in.) 58x42.5x15(cm.) decimals were rounded up. :P Sorry if this is has some stupid questions. I just wanna be prepared unlike I was with my IJ. She just needed a home fast and she came with everything in her tank, substrate, water, hide, and a branch plus her and obviously the tank for $125 and I didn't have enough time to really research everything for her. Anyone with good care sheets could you link them for me? I've read quite a few but just want some more input. Sorry for the long post. Thanks in advance guys!!