Proportioning valve question for disc brake conversion

Well i thank you for understanding. For some reason this valve thing has been screwing with me. But i wanna sum it all up now, so i need to install the adjustable proportioning valve above the stock combination block and it needs to be attached to the rear brake line do i have that correct? Also do you think i can go to the auto parts store and just buy some pre-flared and ready to use brake lines? If not then im gonna have to go get a flaring tool and do it myself.
No. If you decide to use the aftermarket proportioning valve, all you need to do is plumb it into the line TO the rear brakes. If the master cylinder is a dual reservoir and has a separate line that goes only to the rear brakes, yeah I guess you can plumb it at the master cylinder, but I've never done them like that.