Welcome to AA!!!!!!!!!!!
Sounds like you have a pretty good idea of where to start. You don't need a skimmer for the cycle or even lights for that matter. I had both when I cycled my tank just because i got everything ahead of time.
Are you planning on a sump? I would suggest one as they help in many ways. It does not have to be a fancy acrylic one either. The extra water volume and a place to put your heater(s) skimmer and other things make the sump a nice addition!
What kind of tank are you planning? FOWLR
or Reef? This will determine what you need in addition to the equipment you listed.
I personally do PWCs every other week of 25% of my total system volume (about 25gallons). More frequent PWCs help maintain trace elements, reduce phosphates/nitrAtes and keep your fish happy with fresh (SW
80LBs of rock is excellent! You have been paying attention!