I have recently moved into a bigger house, yay!!! So I now have room for a tank. I am thinking of a 150 Gallon reef tank with a refuge sump and a protein skimmer. Here alas some questions to know how I need to set everything up.

How big of a refuge sump tank would I need to efficiently filter my display tank of 150G?

How does all the plumbing work? To be more exact I know I need a pump to go from the sump to the main tank, but do I need a pump coming from the main tank to the sump? Or is it all done with gravity of overflow? Refuge/sump will be on the bottom if that helps any? Also all equipment I want on bottom, Chiller and heater if I need them, protein skimmer, hydrometer (or does this need to be in the display tank?). How would I keep the sump or main tank from overflowing with a power outage?

Also would like to know with this kind of setup is it beneficial to having an ozone reactor or UV Steralizer, or are those things I can do with out?

I know alot of these are noobie questions, but been having trouble finding the answers on my own, since it seems that just about all tanks are different in regards to all this.