To turn off for the night I shut down from my Mac web interface, then turned off my Ender 3, then switched off the power supply to my Raspberry Pi 4. Is this the correct order? What is the correct order to turn them on?

With the ip address will I be able to access my printer from anywhere, for example work, remotely, as long as everything is 'on'?

This installation tested the limits of my current abilities and it took me a minute to figure everything out, got it working in the end! Have ordered a camera for it too. I bought the Raspberry Pi 4 8GB which I'm now thinking is overkill and I'm thinking about purchasing a 2GB RPi3 board, SD card, printing a case and using that instead, and using my 4 8GB as a computer. Any advice for or against this?

Any general advice? As in, don't make this common mistake, etc etc? Let me learn from your mistake(s)!

Eta: I haven't used the ethernet port and I have no intention to. Is this ok? Am I losing a lot?