1) I would place the MOBO on the anti static bag it came in, and try to work in a area that has no carpet.
2) Yes take out the speaker and plug it in.
3) You can use a jumper to turn on/off the computer. Just touch the jumper to the power switch pins and the computer will start and touch to turn off. Unless you have a extra power switch you can plug in.
Frist I would take out all the RAM,GPU and unplug all drives and power on. If you get beeps you know that the board and the CPU are getting power and good. No Beeps could be bad PSU or MB.....Very rare bad CPU.
Turning it on is easy, find the pins that would be connected to the power button, and short them with a screw driver, this is all your power button does as it is just a simple momentary push button switch.