The first thing I do? I thread them, plug them in and see if they sew!! Then I dust them off, grab the manual and oil all the points that the manual tells me to oil. Ok...so I'm telling a fib...I don't use the manual, I just oil everything that I see that moves.
Just remember with these little gems, that if they are plugged in, there are ON! If you leave the machine, unplug it. When you turn the light on or off, that's all you are doing is turning the light on or off...the machine will sew no matter what as long as it's plugged in.