1. Very easy. There is a 12v constant, 12v switched (IGN), and ground.
2. I powered my LCD using the M2. The M2 comes with 2 standard molex and 1 floppy molex. What I did was take some molex connectors I had laying around (from spare parts) and then cut it so I could solder the wires. I attached the power wire from my LCD to the YELLOW (12V) wire of the molex and the ground wire of the LCD to one of the BLACK wires on the molex. Then I just plugged it into the M2.
3. For the switched IGN wire I just tapped into my radio (head unit).
4. Very easy.