If you are asking about what is need to make a DC motor run properly, then the answer is a DC supply at the correct operating voltage and current capability for the motor.
If you are asking about making a DC motor from scratch, then you will need iron/steel or similar magnetic material. Depending on whether you want a permanent magnet or wound coil field for the motor, you will need high hysteresis or low hysteresis metal for the field.
You will need insulated wire to make the windings for the armature, you will need some form of insulator material to keep the segments of the armature from shorting to each other. You will also need a properly equipped engineering workshop to make the various parts of the motor, and a lot of patience. It is probably easier to go out and by the appropriate type of motor.
