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Yeah, the biocube will have most of the dry equipment you will need. Stuff like sand, rock, etc, will be seperate. A heater, like Carey said, is the main thing that it doesn't come with.
On a saltwater aquarium you will need more flow like a koralia powerhead, and a heater. There are a few things you will want like a refractometer and if you can an auto top off for it. If you are going to use a stock light you can have softies and LPS.
I wouldn't place an aquarium in front of a window if at all possible because of heat in the summer and cold in the winter.
For softies like leathers and mushrooms and LPS like frogspawn and candycane. You can check out this one http://youtu.be/RlAuZlniqZ0 he has done an excellent job.