Hi Spencerdeathwaltz,
Main advice: Look into a much bigger case, the one you showing here is far too small. Depending on what other gear you might have you might need a large or a medium size casing but I advise strongly against such small case.
Depending on how much synthesizer experience you have, you might need to read yourself into the basic principles of synthesizers and of modular in common.
A good start would be the post I just replied today to, which is here in this Forum as well, also in this Rack section and then look for the post that's called: "First modular rack build" from Metal_Serra. I explained there in many details about rack space, modular basic setup, etcetera. That should give you a good jump start then.
Good luck and kind regards, Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads