Koepel:
You can use a single 12V power supply. There is no need to add extra things to it.Is it a small peristaltic pump ? Those require 0.5 A maximum. You can also use transistors or mosfet for those.
So I wont need to worry about the back emf or whatsoever?Well im planning to up the project to use multiple pump.But testing with one and messing around the config first.