So many questions

For feeds and speeds we have (very conservative) defaults in Carbide Create for a variety of materials.

For more on that see:

and the videos:

and there’s been a lot of discussion here.

One testing procedure which makes sense (at least to me) is:

(I just use the Carbide Create defaults)

Yes, you can get small device for Carbide Motion — anything which meets the system requirements will work, or you can get a Raspberry Pi 4:

Some folks bolt a TV to a wall and use that as a monitor.