Stocking my new tank with Corals - Newbie

Once my tank has reached its 2 month mark. I would like to start adding Corals.
Looking for some advice
How many pieces should I start with?
Here is a list of some of my favorites:
Chili Coral
Christmas Tree Coral
Colt Coral
Brain Coral - Open Green
Plate Coral - Neon Green
Mushroom Polyp - Ricordea Orange 1 Polyp
Mushroom Polyp - Ricordea Blue 2 Polyp
Nepthea Tree - Green
Brain Coral - Lobo Red
Candy Cane Coral
Mushroom Coral - Ricordea Yuma
Zoos - Pink
Leather - Stubby Fin
I tried to start with easy stuff.
TANK SPECS:
Oceanic 90 gallon corner tank
Compact MH, Corallife tubes, with moonlight
Corallife 125 gallon Skimmer
1/4 hp Chiller
90 lbs of live sand (black)
150 lbs of Live Rock (Fiji)
 
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