going back to mechanical fuel pump

When I bought the car it had an electric fuel pump installed in the engine bay, previous owner knew it was wrong but it is what it is.

I now am going to go back to a mechanical pump fuel system. I bought a carter high volume pump.

What I need to know...Is there a place where I can get the complete fuel line system?

Also, I have a question about electric fuel pumps. The one I have on now is on a switch in the dash. Is the correct operation to turn the switch just before trying to crank or during cranking? Sorry, very unfamiliar with electric fuel pumps and just curious.