First off, but q ramn test kit! You say you've had fresh water for 10 years but don't have a test kit or tried using one on your salty? I hate to see the shape of you fresh water fish. Second, get a new stand! Who in their right mind would out a 55 gallon tank on something that can't properly take the weight. Then get live rock. It will look better anyways, and it is the primary source of food in a salt watertank. Depending on your fish, you won't even need to feed once the rock has grown and thrived a bit. Add the product cycle and after a couple days add one fish (a cheap one). (its waste will help speed up the cycle). Check parameters 2 times a day and take approperiate action to maintain or correct parameters. A week later add another fish (granted the other one is still alive). The main thing is get s test kit for everything. Saltys are very delicate and if one thing is off slightly, it would cause everything in the tank to die. A lot more maintenance and work to keep it healthy.
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