Welcome!
I just moved my 60g, it's quite an adventure. I agree with everyone on not buying a fully setup reef, I've never done a FO or FOWLR, but I imagine it's a lot of the same process.
I bought a rubbermaid stock tank to use as a temporary holding tank. I wanted to start mixing the water prior to moving, but plumbing difficulties prevented that. I would suggest you put Flex Seal on the inside and outside of the plug, let that dry a few days, put 2+ mil plastic lining (like the painters liner), then start filling with water, getting to temp and start mixing your salt. Ideally, you'd want to match your new water to the existing tank water. Next, I setup the equipment and live rock. I'd then move the livestock into the holding tank. This way, you can drain the old water (the existing tank water holds very little bacteria anyways) and move the tank/stand/canopy without worrying about hurrying. Once you move everything to your place, you can decide if you want to work on the stand/canopy before you fully set everything up. You might want to throw a new paint on, sand/re-stain, whatever color scheme will please you. When you have your tank sitting on your stand (and sump, if you're doing one, under your tank), you can work on plumbing it all together. Once that's done, you can leak check your work to make sure you don't have any last minute emergencies, regular tap water will do. Be sure to do a power outage test, this will ensure you don't overfill your sump if the power ever goes out. Drain the tank. Next, I'd rinse the new sand you're going to use (or rinse their old sand if you go that route). Some sands don't need to be rinsed, like the instant cycle ones. At this point you need to decide if you're going to use the water in your holding tank or mix more. I'd then start on aquascaping with your live rock. Remember, rock before sand. Otherwise you'll run the risk of your structures falling (remember you still have livestock in the holding tank, so you might want to add half the rock now and half later if you're going to let the tank cycle again. Setup the equipment on the tank. Fill the tank. Technically you could put in fish while it's still cloudy, but it might put undue stress on the fish. A safer method would be to let the tank cycle before you add any livestock. Put in the livestock, acclimating to the new tank water of course. You should have a successfully moved tank at this point.
Personally, I wouldn't use their sand, I'd use new sand. Assuming of course that you want a sand bed, you could do bare bottom.
There's always different ways to do this, but this is just my way. You could just have the fish in holding buckets and move everything as quickly as possible (I'd still use new sand). Your call I guess.
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