The first thing you need is to match the tank size with the fish you want. Don't buy a 1 gallon betta tank if you want danios. I generally don't recommend the "all-in-one" systems. There are some nice-looking ones that have filters, heaters, and lights built in, but if one part breaks you are S.O.L. Choosing your own tank, lid & light, heater and filter often comes out cheaper and you can customize for your fish. Get the biggest tank you have room for/can afford. The larger the tank, the more stable the water and the less trouble for you.
Search "fishless cycling", "cycling a tank" and "the nitrogen cycle". It may seem like a lot of trouble to test water every day before you have any fish, but it is much nicer to know your water quality is good on day one than to have fish die and not know why.
Danios are egg-scatterers. If you remove the parents from the tank before the eggs hatch, the parents can't eat the fry. Leave room in your budget and your house for a second tank if you think you want to raise baby fish.
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