How can I set up and perform Deep Learning?

I am new here. I have an older i7 (6th gen) CPU, 64GB Ram, 512GB SSD. I just recently ordered two RTX 4090 OC TI’s to run on here. I want to know and understand how to perform Deep Learning on either a new or existing model that I could later use for commercial use.

  1. Regarding the hardware, would this be optimal, or should I buy a newer CPU/MOBO/RAM combo?
  2. Should I install Linux directly on this machine?
  3. Do you have step by step instructions on how I can successfully get this rig going that includes installing the correct drivers for the video cards? How to even start Deep Learning and what are the components involved?

Can anyone help by providing me a series of document/video links?