Wiring and numbers on motor

[Tazz]

I am sure this question has been asked but I just want to make sure I do it right. When wiring the motor (LMT 1950) to the speed controller does it matter where each wire goes and do you solder the wires to the motor or use the gold connectors? Also there are 2 numbers written on the motor, a 7 and a 12. I assume the 7 is the number of turns (because it is a 1950/7) but what is the 12 for?