Have you ever even had a saltwater tank before? The costs to set up and maintain a tank this size would be thousands and thousands of dollars, even upkeep and cleaning (water changes) would be extremely difficult and expensive. I highly discourage you from attempting a tank this size, especially for a first tank. Please, just do some research and set up a small tank at first, if you can keep that successfully then you could look to upgrade to a bigger tank sometime in the future. I am by no means an expert but I think many on here will agree with my recommendations.