Below is a video from cockpitthe one Boeing 737 and starting the aircraft. The images are shot in several booths, at different locations and at different times. But they all look the same, they have as many buttons, and the boot procedure is standard.
When I went to Carpatair Flight Training School, I was explained the steps of starting an airplane and the reasons why the engines start one at a time and not simultaneously.
I also learned some of the on-board equipment, but without exercise and much theory you don't learn to fly.