I personally agree with everyone. If you are fairly new to saltwater keeping, I'd make sure your tank is done cycling - which typically means you are testing regularly and reading 0 NH3 and 0 NO2 consistently over a period of a couple weeks... Then and only then, start looking for your fish. I would wait a few months
at least for the nem... and like everyone said - research. The HARDEST part in this hobby (especially for new people - and still is a stumbling block for me) is patience. FIGHT your urge to rush into any decisions or purchases. Research, research, research... and learn as much as you can. Give yourself some time to get used to keeping the saltwater system. Get down your husbandry practices and techniques, and keep testing which will help you track how well you are doing. Good luck!!