It looks like your post was moved to the correct section. If you are still interested in mining and don't have any problems mining alt coins.
#1 lookup your GPU at
https://whattomine.com/gpus and see what the most profitable coin to mine is.
You did not say how much RAM, what CPU and Motherboard you purchased.
For RAM you need a minimum of 4GB but I recommend 8GB.
For CPU the only number that really matters for GPU mining is the number of PCIe lanes.
For Motherboard the more PCIe slots the better.
I have never mined on macOS so cant answer that part but Linux VS Windows, Linux wins every time even if it is HiveOS. Linux consumes less power and Most GPU will perform better. There is the exceptions to the rule like the first generation 3060.
This part is completely my opinion but mining rig frames are a waste of money specially if you plan on having a decent number of cards. Just get a good old wire frame shelf and some zip ties. Mining rig frames are 100s of dollars, Amazon basic wire shelf is $39, assorted pack of zip ties $6.