Hi and welcome Zach . This sure was a long read for me .
Good luck with your discus and we eagerly await more pictures and info about them .
You shouldn't have mixed discus from different sources without a proper QT since they can Cross contaminate each other but what's done its done , so let's just hope for a begginers luck and that everything will went smooth and well for you at the end .
You don't need pots or any sand for anubias and Javas so keep the bottom sand less than one inch thin in order to maintain easier siphoning and better water quality .
Cheers Zach.