Wrote a series of intro to mining articles that might help you as well as initial build guides depending on your budget. These may be able to help point you in the right direction for some of your questions.
And I have also found various rig frames on Amazon, as well as a power button and a version of Windows 10.
My only issue is finding a Motherboard that will be suited to run what I have found, some I have seen on Amazon have in-built PCI slots, whereas some don't. I am not the best with sourcing Motherboards, but once I have one that fits into the picture, I will be more than on my way.