IF your first thought is "what is the minimum tank size for..." then don't bother.
You WILL need to do big and regular water changes. A siphon hose and a pail aren't going to cut it. Invest and install a drain and a water supply.
FOOD is expensive, mainly because of the amount of it they eat. Do not skimp on feeding. Even between paycheques, they need to eat.
They SMELL. Nobody advertises this, but if it is in your home, vent that room directly outdoors. Water changes help, but there will always be an odor. If you still live with your parents, expect resistance.
Overall care is no more complicated that a regular aquarium, aside from the whole process needing to be 4x larger than anything the average hardcore hobbyist will ever keep. There is huge satisfaction in doing it and doing it well.
Think, Plan, Invest, Maintain, Enjoy.
/Kris