New to marine tanks, need some help...

[Fishward]

You're on the right track.. keep reading and ask as many questions as you need to. lots of extremely helpful people on here.

I run a 6 bulb T5 and if you want some confirmation that it'll be enough for a 65 gallon tank, have a look at Fishytime's tank journal. he also runs 6 bulb T5s. unless you want to keep stuff below more that about 20 inches of water, 6 T5s above it is usually A-OK.

I wouldnt worry about the laminate floor or Drywalll, just make sure you have good ventilation in the room you have it in, and try not to spill water.

get a skimmer rated for at least 1.5 times your tank volume. and some sort of mechanical filtration (ie. filter sock) is a good idea so long as you can commit to cleaning it regularly.

supplements are a whole other question and just searching "calcium"" or "alkalinity" in the forums will get you lots of information. golden rule is: if you dont test for it, dont dose it.