I see you are diving right in. It can be so exciting, but lets take is slowly. Only bad things happen fast with this hobby. That is no joke.
First off, we as helpers want to know:
Salinity/Specific gravity
pH
Temp
Alkalinity
Calcium
Magnesium
Nitrate
Phosphate
at a min.
With a new tank:
Nitrite and Ammonia as well
Next, what lights are you using? What water? Where your rocks dry or live? All this will help determine the stage of your tank. It will help us on how to proceed when you get the new corals. You may need to add food, bacteria, aminos, light, water changes, etc.