You've been keeping a FW
tank for a while. That shoud help a bit, but I'm now learning that SW
is a whole new world. If you're not familiar with SW
, you should think about buying a good book. Everyone always suggests The Conscientious Marine Aquarist by Robert Fenner. It'll answer a lot of questions.
As for rock, you should think about getting a total of 1.5-2 lbs. The ratio of live/base rock is up to you (I'm gonna go 50/50).
And if you're gonna get live rock, you don't need a lot of live sand. The live rock will seed it for you. Save money and buy the non-live stuff and seed it with live rock and maybe a few cups of live sand from an established tank (maybe a neighbor/friend/lfs
Everyone here raves about the AquaC line of skimmers or the Bakpaks. I don't have experience with neither, so I can give you miuch advice except that I heard great things about them and I'll probably buy an AquaC within the next week or two.
You got a great deal for your tanks and stands. You're off to a good start. Welcome to the forum. You'll get a lot of great advice here from the other users and advisors. Good luck!