Hey there. I'm no expert by any means but this is what I know. Your saltwater tank needs benificial bacteria to handle the uneaten food and waste you fish and inverts produce. There are many ways to cycle a tank try doing a search to learn more. Your ammonia will rise to a very high level along with your nitrites and nitrates. Then they will fall to 0. Then it's ok to slowly add fish to your tank. This is a VERY brief explanation.
Very long explenation is need to fully explain.
Go to yahoo.com and type in Aquarium Cycling. Then you will see just how many opinions and therioes there are about how to start and maintain during a cycle.
Good Luck