Before the rest of the others jump in, I will give my 2 cents and thoughts.
First, welcome to the hobby. It is something new for me, but I am learning and enjoying all there is.
Second, saltwater tanks need to cycle before putting less hardy fish in, so be careful of what you buy. A cycle is when ammonia and nitrites peak and fall. After the cycle, your tank can handle more less hardy type fish. Don't just jump in with a whole bunch of things. You will be thowing you money away if you do.
Third, think about your tank and tank needs. What equipment do you have right now. Is crushed coral the best substrate you can afford? Many will suggest dumping it and going with a 4" deep sand bed (dsb). Are you able to purchase any live rock (lr)? If so, again many will suggest 20-30lbs of lr. Both suggestions are good and are benefitial to a tank. If you are planning a reef tank some time down the line, lr is most likely needed.
Fourth suggestion is to read. Buy some books (many will suggest some) and also read here all the questions and answers people have. It might not apply exactly to what you are doing now, but info is always best to know.
hope this helps.