How old is your tank? Is it cycled? What are your ideas regarding it's future? You need to look into the future about a year and decide now where you are headed if you want a smooth ride (or smoother than most).
First, is it going to be a FOWLR or reef tank. If FOWLR, is it going to naughty or nice? For example, you cannot have a humu humu with a small hawkfish. It will get eaten. Sounds like you want a nice tank.
So give us the details, age of tank, parameters, how much LR and LS you have, etc. and we can go from there
Just make sure that you design the tank in your head before you go forward with your purchase of livestock. Write it down. Start a computer log. And most importantly, be patient. Don't be me. If you look at how much I have in my tank in my signature, you will see way too many fish for a tank my size and age. If I were to do it again, I would have half this amount until I hit the six month mark, then increase again.
There are also types of fish that should be introduced last into the tank because they are very terratorial. You want the others to have defined their terratory before putting in the "problem child".
And never work on impulse. Period.
There......that will get you started.
From one newbie to another.........good luck. John. _________ 90g HW: 20g Sump, ETSS PSw/Mag9, CPR OF/Rio 2100 RTN, MJ AC 2K3 PH's (2800GPH ttl flow), 300W htr, Gnd Prb, Denitrator, UV, PCs: 2x65,4x55 Fish: Ylw Tang, LM Blenny, Hmbg, Y-T, Ylw dmsls, Mrn Clown, Coral Beauty, Red Crs Wrsse. Inverts: Snls/HCs, CBS, P-mnt shrmp x2, Sandstar, Condy Anen, Tbe Wrm, Sea Apple. Frags: Frgspwn, Kenya Tree. Corals: GSP, Zoos, Shrooms, Lobo Brain, Turbinaria, Mshrm Lthr, Fngr Lthr. Other: 127# LR, 1-2" LS DOB 5/7/08  | 
new fish for new tank 
