To have a hamster, first you need to have a cage and a lid to the cage.  (Always make sure you close the lid to the cage.)  Second, make sure you have a food bowl.  Make sure you feed your hamster every day.  Third, get a water bottle and a drip dish.  Make sure you fill it up when it is empty and refill it every three days.  Finally, get a hamster wheel and a hamster ball.  Let it exercise every day.  Give it some treats too!  Have fun!