Raspberry Pi Mesa 7C81

Hello
I couldn't really continue with setting LinuxCNC up. But I want to probably use a touchscreen to interface with the machine. What size is recommended. The Machine should be a CNC-Lathe in the end. Do you have some recommendations? Also maybe not topic related, but I was wondering if you can set up remora so you can drive the spindle with step/dir?

How did you enable SPI? I didn't find it in "sudo menu-confg" and "sudo raspi-config" command not found.

Look under /boot there should be a folder called broadcom, or something and config.txt will be there.
The image is not a Raspbian OS based one but based on plain Debian but with a suitable kernel.