Generally relays come marked with their respective part No. and a WEB search usually brings up Manuf specs.
As a last resort, a little reverse-engineering of the board shows the pin out, there is usually a diode on the board across the coil terminals.
Also must be a Universal motor (AC/DC) if the fields are in series with the armature as it sounds.
The rpm on these are controlled principally by the load
Depends on the S/W being used, I use and am familiar with the free Kicad and you can add components as you wish.
For the physical layout, you would also need to provide a footprint.
It is simple to use two N/C. L.S. in the two motor conductors, A diode rectifier is wired across each, connected so they only conduct if the switch is open and the correct polarity is supplied to reverse.
I can post a pic if needed. One show the L.S. Diode method.
Bit of a misleading title, "monitoring Mains Power consumption" when really asked is the presence or absence of current.
Mains Power would be Wattage metering.
That appears to be one of those $2 - $3 version off ebay, usually a 555 PWM, You would need to do a little reverse-engineering of the circuit, i.e. draw it out on paper and go from there.
I have always used a local engraver that uses reverse engraved Lamacoid, pick out a main front colour, then colour for all the reversed engraved images.
Smooth front and can be wiped clean anytime.
If you use the chassis GND for reference, voltages will negative with respect to it.
If you want to use the conventional mode, then use the -ve side of the bridge as the reference.