+1 on wetwebmedia, the single best source of info out there.
My advice:
Don't add any trace or supplements you aren't testing for, and use good test kits, very rare to have to supplement unless you have massive coral growth or don't do water changes regularly. Weekly 10 to 15 percent changes will take care of everything
Develop a relationship with the best LFS in your area if there is a good one.
QT everything wet that goes in your tank for at least 6 weeks
Invest in a couple of books, the information is more in depth than magazine articles.
Have a complete stock list in mind before you buy the first living thing to put in your tank and add very slowly, nothing good happens fast in a reef tank!
Life is much easier with a sump, and a skimmer is a very important piece of the puzzle for a new reefer. There are other ways but this is the easiest for a new reefer IMO. Canisters and HOB filters are excellent at breaking down nitrogenous waste, and the result is algae.
2 small heaters are better than 1 larger one
Don't cycle with fish, and never add a fish you think will be temporary, if I had a buck for every damsel, chromis, and six line wrasse I've seen people trying to regime after a tank was established I could afford a much larger reef!
Live sand in a bag is a sham, use aragonite and seed it with a small amount of sand from a fellow reefers established system
Most importantly... Don't accept any one person on a forum's advice as gospel, forum advice is free and you generally get what you pay for!