The specifications you have given for the stepper motor will work well but knowing the holding torque is necessary to know if they are up to the task you plan to put them to.
The driver board you linked to is a 3 axes board so you only need one. You will need to run the steppers at higher voltage than the name plate value (usually up to 20-25 times) to get any useful speed out of them so you will also require the chopper board mentioned on the link
As for a power supply; there is loads of information on how to build an unregulated linear power supply or you could just use PC power supplies as described at the very top of this forum.
It all can be a bit overwhelming to start; just take one thing at a time and you will get there in the end.