how to turn a universal motor into a generator

I took apart an old vacuum cleaner with 12 amp motor, made for U.S. 60
Hz AC household use so I could experiment with turning the universal
motor into a generator. I know it's a universal motor because
applying 12 volts from a battery will get the motor to turn, same
direction regardless of battery polarity. I wanted to experiment with
it as a generator, so I used an electric hand drill to turn the
motor's shaft (quarter inch shaft fit right into the chuck) and
connected a car taillight bulb to the blades on the plug. Spinning
the motor didn't light up the bulb, so I touched a twelve volt battery
to it to get some juice going and set up a field in the motor/
generator. The bulb went out as soon as I took the battery away, so
that was no good. I tried this turning the shaft in both directions,
and with a much smaller bulb that draws less than 100 mA at twelve
volts.
Perhaps the hand drill is just too slow.

First question: Would this experiment likely work if I turn the motor
several thousand rpm?
Second question: Which direction should I turn it?
.

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