No real science behind it. Relocation is usually done for convenience of service or space issues. Find an accessible location for the remote mount, not too far away that you can plumb the lines without excess length or bends. Use decent size hose like at least 1/2" (-8).
As for brakes, I tend to spend money on front pads and not just use the lowest common denominator stuff from the parts store. I used Performance Friction the last time and others have used EBC or Hawk. Again, know your usage. If it is just a street car you should buy pad material appropriately. I tend to buy higher end street stuff for my daily driver. I don't track it, but I do drive it fairly hard at times.