Advice: Make sure you know which fish are compatible with each other. Don't just go with what looks good.
Don't use fish to cycle your tank, no matter if they are "hardy" or not. Ammonia and nitrite, even at low levels, are very toxic to fish. It may not kill them immediately, but it does irreversible damage to their gills and membranes, and I'm sure it can't be very comfortable. Would you like to swim around in a swimming pool full of battery acid, even if it was just a "little bit"? Didn't think so! :-) Sure, cycling takes some time, but it's worth it to have healthy, happy fish in the long run. Patience is a virtue!! haha
Test your water fairly often, just to make sure everything is okay.
Make a maintenance schedule and keep up with it! Ammonia is one of the first things to look for when you start losing fish. Don't just blame the pet store for selling you sick fish! A good maintenance schedule will make your life (and your fish's) a lot easier in the long run.
If you're not going to be 100% into this hobby, then don't even get started. It takes time, patience, a lot of work and some money to keep fish/aquariums successfully. If you barely have time for everyday things, you probably don't have time for fish, which isn't fair to them. You're responsible for the environment they live in, so if you neglect the tank, they suffer. It's not just as easy as adding fish to water and hoping everything works out.
Quote: Live every day as if it were your last, because tomorrow it might be! :-)
About Yourself: My husband actually got me into the hobby, he kept fish in college "back in the day" haha. He kept talking about it till it sparked my interest. Now I'm hooked, and I know more about it than he does! :-) Fish keeping/aquariums are relaxing, enjoyable and challenging, and I have found that fish really do have personalities. :-) I'm a stay at home mom and caretaker for my mother-in-law, so I really look forward to some quiet time with my fish. :-) Not to mention, a well maintained aquarium makes a house look twice as nice!