A fish tank is just like having a dog or a cat when it comes to the amount of effort on your part. In order to have a successful fish tank you will have to work at it. Once a week, or at most once every two weeks, you will need to perform some kind of maintenance on the tank. Most of the time you will be performing water changes. You will also have to feed your fish at least once a day. If you are up to the challenge, please proceed!
It's a good idea to have in mind what kind of fish you want to keep before you purchase an aquarium. Some fish only grow to be an inch or two, whereas other types of tropical fish can grow 12 or 13 inches in length! Knowing what kind of fish you want will help you decide the size of the tank they will need. If this is your first time with an aquarium, I would recommend going with a 10 or 20 gallon aquarium for now.