That kit will give you a good start, but in addition to what's included, at the very least, you'll need:
-A stand that can support at least 300 lbs. (that's about what a full 29 gallon tank will weigh)
-Water (either treated tap water or PREFERABLY reverse osmosis & deionized water commonly referred to as RO/DI)
-Salt mix
-Lighting
-Powerheads to provide in-tank circulation (the filter that comes with the FW kit probably won't provide enough circulation on its own; think about how much flow the ocean creates over the reef)
-Test kits (including a hydrometer or refractometer)
The filter provided with the kit likely won't be enough to keep the water pristine enough for the long-term health of the creatures you'll be putting into the tank, so after the items listed above have been purchased, I would high consider adding at least about 20-30 lbs. of live rock to the tank (it will not only function as decoration in the tank, but also provide a good deal of biological filtration.
A protein skimmer could be added to strip waste out of the water, but a 29 gallon tank can survive just fine with weekly water changes of 5-10% of the tank's volume.