Here is my .02 cents! Ceramic heat emmiters not a good source of constint heat for a Ball. Useing a ceramic or bulb, set up on a timer to get a basking spot of 90 degrees tho is a good idea just make sure that they are not placed over a hide! Balls get there heat from there bellys. When in his hide how is the substrate going to heat up to a degree that is optimal, 88 to 90f. If you place the heat emitter over his hide or a heat lamp for that matter it turns it into a oven! I do not know what kind of heat pad came with your kit but if it is a zoo-med or one of the other popular brands you should be just fine with it! As tigerlilly said you will need to buy a good quality thermostat or a dimmer switch! You can buy a Lamp Dimmer switch that comes all wired for around 10 dollars at home depot or lowes! All you do is plug it into the power strip and then plug your UTH into the plug that is on the dimmer switch and you can control the amount of power being used to run the UTH.
Definitly some way to measure the humidity is a must aswell. When measuring temps you want to measure the temperature on the substrate. Like i said before that is where balls get there heat from.
There are lots and lots of caresheets out there aswell but you probablly alraedy know that! lol

Good luck and welcome!!