I recommend browsing our beginner FAQ and recommended reading list in the
library and getting a good intro book. Something like
The Conscientious Marine Aquarist would be a good choice. Also, do some searches/research here to get an idea of what the species needs are that you're considering keeping. That should give you some idea of the type of setup/budget required for certain animals.
I agree that the 40 gallon is a nice size to start with, however, based on some of the fish you're considering a 40 gallon tank would be way too small IMO. If you're seriously considering multiple tangs you should be shopping in the 6' long / 200 gallon range IMO. If the 40 gallon is what appears to fit your budget than you should start focusing on smaller fish.
As Waz mentioned, the Moorish Idol is not a good idea. They are notoriously difficult to maintain in captivity and have a poor survival record. There are some similar looking Bannerfish (
Heniochus sp.) that would make a much better alternative. Unfortunately, none of these fish are really appropriate for a 40 gallon tank - you'd need something larger.
I second the advise to hold-off on an anemone. They require strong lighting and good, stable water parameters. They're best left for later when you have more experience.
Also, the chocolate chip star is pred
atory and not considered reef safe (they will eat corals and even small, sleeping fish).
I also recommend against the Harlequin shrimp as well - as Waz said, their natural diet is starfish (not very convenient to provide).
Sorry to come-off like we're raining on your parade - there really are a lot of cool things you can keep in a 40 gallon. It's just that setting-up, stocking and maintaining a successful reef tank requires a bit of planning which is part of what we're here for - to help with these questions. :wink:
JMO & HTH