This Expert Village gives an brief overview of what is needed to set up a saltwater tank. It should be noted that this information pertains to a fish-only tank. Though the information he gives is correct, it lacks enough detail for the prospective hobbyist to start a tank without looking at other sources.
This video by Doctors Foster & Smith shows all the steps from building the tank to adding fish. This video is significantly more detailed. This particular video is for fish-only tanks. A similar video for fish only with live rock (or FOWLR) tanks can be found here. Doctors Foster and Smith also have videos about acclimating fish and invertebrates, testing aquarium water, and photo-acclimating coral. Doctors Foster and Smith make videos about all types of pets, so they're worth checking out for any animal lover.
This video gives the steps to setting up a reef aquarium. The video is just text over images, and sometimes the text can be difficult to read. What is nice about this video is the creator lists all the equiptment one needs. He breaks up the list into 4 categories: definately needed, potentially needed, probably wanted, and good to have. After going through the setup of the tank, he lists the tasks one must do to maintain a tank. Again, he breaks the list up into categories: daily, weekly, every two weeks, once a month, and every three to five months. He also recommends some of his favourite websites. While he gives lots of useful information, it does not have the advantage of showing how to set the tank up.