A machine like this I can't believe there's anything wrong with it that a cleaning/oiling won't fix, including the motor. As far as a manual, I don't know what it will tell you that we can't. The lever is your forward/reverse, the knob and window are for the stitch length, the knob on the top left above the face plate is for presser foot pressure,and the knob on the bed is the feed dog drop. it threads just like any other machine: thread guide, upper tension, take up, thread guide(s) and needle. Since it's an end loader pay attention to how the needle is set and threaded so you can replace it the same way.
Cari