How do go about installing fuel system?

Let me see if I can decifer this bare with me. I was always under the impression that you didnt need a return line with a electric pump? I do have a Holley regulator that I can use in this system but with 2x600 holleys and a tunnel ram i figure im going to need every bit of that 8psi.

Am i correct in thinking the regulator will regulate the pressure and in turn kick out what it dont need back to the tank?