What do you need to make a cordless drill motor remote controlled and spin slower with more power as you want to make a small remote controlled winch able to pull 50 lbs. about 10feet and reversible.?

Remote controlled: buy a cheap RC car and steal RC circuit from it: use circuit output to close a relay controlling the drill motor.

More power: if the drill has a torque switch, set it to the most torque (slowest speed for pull of the trigger). If not, add external gearing to accomplish this.

Great site for tinkering: mcmaster.com