here is a link for cycling your tank, I would suggest you return or have your fish store hold them for you while you cycle your tank. As stated you can possibly lose all your fish to ammonia poisoning. The very next thing you need to do , and I mean quick is get a water test kit, API saltwater master kit. Ity will have ammonia, hi ph, nitrite and nitrate tests included and is abotu $20 on amazon. It is vital that you have this test, especailyl if you decide to cycle with your fish.
Cycle your salt tank