Circuit for control of a Hydraulic Motor using Arduino Uno

Complete novice to electronic circuit design and arduino programming.

I'm working on the design of a complete system to control the speed of a hydraulic motor, using a 

This will be done using an Arduino Uno microcontroller, to drive the solenoid of a Bosch proportional valve (uses 5V)

http://www.hyprox.fi/datasheets/4WRE.pdf 
(Link to proportional valve, size 6 to be used)

A speed demand signal will be obtained from a user dial (a potentiometer)

Speed feedback will be obtained from an optoelectronic pole wheel fitted to the output shaft of the hydraulic motor. 

Proportional negative feedback will be used to control the speed of the motor.

Looking for help on: a circuit diagram/design, and also the sketches (code) for the Arduino relating to each function

Many thanks in advance for any help

Have you tried researching similar projects using arduino uno to control speed? Please don't expect someone would feed you everything you need. If you have a possible setup or even started the coding and encountered problems, would gladly help..

Cheers!