Heating tips … depends on how familiar you already are with heat tape, etc. For smaller racks a lot of people opt for back heat but I prefer belly heat. Flexwatt heat tape is easy to find and ReptileBasics has a whole series on how to terminate it.
There are tons of places online to find these products and tons of different products so definitely shop around. 
See this page for tools, etc: Heat Tape
And this page for a general guide of dos-and-donts: Heat Tape FAQ: Reptile Basics