The reason for the questioning about your flooring is simply because you're looking for advice on setting this tank up and still in the planning stage. If you're going to want to keep an anemone you will be much happier in the long run if you can get away with some type of sump system, even if it only adds 20-30 gallons to your system. If you decide to get a tank that is drilled it's going to be hard to help you out beyond your original questions, but that's going to be your call, I think we're all just trying to help here, besides without getting slightly off topic you may not have got that tank suggestion. The point of the above rambling is you came and asked what the current "understood" requirements for a Nem tank are. There is no hard and fast, but like Bonsai said, learn from others mistakes and do it right the first time. If you want to buy a 37 gallon bowfront, slap a HOB/skimmer on it with a dual strip T5, knock yourself out. As many are pointing out though, you may not be happy with that setup in the long run.
In regards to your specific questions, you can set the tank up here however you like. There's threads on here about skimmerless tanks, there's threads on here about ATS (Algae Turf Scrubbers), Canister filters...etc. 90% of people are going to tell you to get a sump, add a skimmer and get about 3W per gallon of light. That's about as impersonal an answer as I can give directly to your question. What kind of lighting is going to be up to you, LEDs, T5s and MHs all work and really are a matter of personal preference at this stage. Nems are a bit more forgiving about lighting then lots of SPS so read around and decide what you like.