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If you are getting no reading when you connect the red probe to the base and black probe to the negative voltage input ( when the circuit is all attached and voltage supplied) that means your variable resistor or potentiometer is dead.
Learning Arduino ( arduino.cc ) will be easier and helpful , also good knowledge in of Physics and Mathematics is a plus point.
You can start from arduino controlled Seven segmented display then to 16*2 lcd display and then to advanced displays and to other micro-controllers.
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