lol even though I am a nube I can answer some of these questions..
1. Coral rock is the best thing to make your reef out of, you should be able to get it from your local shop or off trademe, have a hunt around. If you wanted to start stocking soonish (but being in a hurry with a marine tank is a bad idea) then you would need to purchase rock that is already alive and filled with good bacteria (ie stuff that has already been in a running established marine tank for some time). Otherwise you need to cycle it yourself before you can add any fish, and even longer before you add sensitive stuff.
2. Unsure but I do know that some fish/corals are very sensitive to temperature increases and when you have high powered lights and summer etc temps can start climbing, I guess you would have to run your setup and see if you need one.
3. Unsure with marines but we have a robocan in the house with a tropical tank that is covered with no issues.
4. People have changed names on this site before so it can be done, I would contact a site admin person and discus it nicely with them and see what you can work out.