Considering a fish tank?

You have not given any information on what you really want.
Tank size etc. is what you must decide on your own according to your budget or available space at home. If it is flexible then it is the best, since we can have more room to adjust your plan. Just how much do you want to spend on the whole setup?

You must also at least decide on if you want tropical fish, or non tropical fish.

Without more of the minimal required information, we can throw hundreds of different setups at you that might not even fit into your expectation.