CAN Bus first steps

In a few months, I will need to build a project that will let me connect from my PC to a power supply via CAN bus.

I don't have this power supply here and have zero knowledge (even less) of how to do this.

I want to prepare by arranging a demo, to put some device that I want to give commands to, from my PC, and see that it connects, and also be able to read something from that device.

My guess is that I will need a device, a wire to connect to this device, and a converter from the USB or Ethernet connector of my PC to this type of wire.

As you can see, I'm clueless. I will appreciate any help in these first steps, like what should I buy for this, nothing is too simple for me.

Thanks in advance for any help.