A night light? most fish tanks have lids. Feed your fish and turn their light on when you wake up, and feed them before you go to bed, then shut their light off. Try to keep the tank out of direct sunlight.
You Will need a filter. Get one that is rated for your tank size.
You will also need a heater rated for the size of your tank.
i like to give my fish more than one kind of food, just like you and i like to eat more than one kinds of food.
your tank will also need water changes every 2+ weeks. this can be done by a fish tank vacuum.
Good luck