If you want slightly easier. I'd use a submersible pump in the aguarium with tubing up to hard piping in the main tank.
The mag brand is good. Estimate the hieght between your pump and the top of your display tank and make sure your pump flows at least 100 gallons at that distance.
I think a mag 3 might do the trink.
Then you'll also need an overflow box(assuming your tank isn't pre-drilled. I like the look of the cpr brand, no u tube.
You'll need suft tubing down from this as well.
Thats the basics.
I'd put two heaters in the sump each rated at about 60-70% of total system capacity.
I'd then put 4-6 inches of live sand, aabout 10 lbs of live rock and a baseball clump of culpera.
That's what I would do with your set-up.
Oh and I'd leave some room in your sump for the small amount of drainage that would happen if your pump shut off. There is a formula to figure out how much room to leave.
I'd also run a light on the refugium on the opposite schedule of my main tank lights.
I'd also get some kinda of semi closed cover to reduce evaporation.
That's more or less what I would run with you setup.
B