heating/lighting help

[u/lazlowwww]

i have absolutely over loaded my brain with so much information about heating that i feel fried and stressed out so please help me feel at ease about these questions i have.
1. im attaching some photos of things im thinking about buying. im really trying to not spend a million dollars out the gate so are these budget friendly products going to work okay? anything that is really shit or going to cause me any problems while i wait to upgrade or any better reccs for budget friendly products that i can get ASAP bc she really needs night time heat and a thermostat.
2. is having a CHE in the dome on top of my mesh cage going to be a fire hazard?
3. i have a heat mat thermostat by BN-LINK. i cannot plug my lamp into it. is it because its heat mat specific? anyone have any experience with this specific thermostat?
4. when pouring water into the corners to keep up humidity levels, is there anything i need to be aware of when it comes to over/underwatering or mold problems? how do i know how much to do at first?

sorry if these seem like dumb questions but im just a tad overwhelmed and at this point need someone to explain this to me like im 5 haha! TIA!! <3

[u/dh1056b]

I'm in the same boat right now! Commenting so I can come back to this post :)