What are you writing, a thesis? I've read quite a number of those (and written some) that have to do with DFT, but I've never seen one that started quite that far back.
Seems like unnecessary work, frankly. After simply stating the Schrödinger equation and possibly the Born-Oppenheimer approximation so you have the electronic S.E.,
I'd suggest starting with Hartree-Fock and Kohn-Sham theory, or thereabouts.
You might want to try to find
https://www.amazon.com/dp/981022771X/?tag=pfamazon01-20. It's a reprint of some of the most important papers in the field, the ones not in English (such as the original Born-Oppenheimer paper) are translated.