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To change the direction of the motor, change the polarity of the armature. To increase the speed higher then the nominal speed on the nameplate, you can drop the current in the shunt winding with S2.
All resistors must be high power resistors with the power of the winding.
Speed control by resistors in the current way of the armature is normaly. To make the speed higher by attenuation of the field in a shunt motor is only a compromise if you don't want to change a motor.
look for the nameplate of the motor. For example look for this nameplate of a shunt motor:
The red numbers are the voltage and the current of the armature and the blue numbers are the voltage and current of the field winding.
The following example shows the nameplate of a series motor.
Here you see only one voltage and current (24V and 13A).
With the voltage and the current you can calculate the power of the resistors. (P = V*I).
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