My suggestion - Buy a good, detailed how-to book on the subject...doing so will save you from a lot of potential headaches. Whatever amount of money you spend will be worth it.
There are a surprising amount of things to consider when setting up an aquarium, here are a few:
Having the right amount and mix of types of fish.
Monitoring your ph and acid levels so as not to poison your fish.
Live plants or artificial? Live are considerably more work, fake ones just don't look as nice.
Salt water tank or regular? Some of the types of fish you can put in a salt water tank are just spectacular in appearance (almost nothing in a regular tropical tank can compare), BUT, maintaining a salt water tank is much more time and labour intensive, not to mention much more delicate. Plus, generally the fish are far more expensive.
There are many more. BTW, can't help you on where to shop, as I don't live in Cowtown anymore.
Like I said, buy a book...trust me.
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