I am a breeder of hampsters.
A simple cage will do, but I reccomend a fish tank (Aquarium) just keep it without water of course. Buy some pine chips at your local pet store, place them at the bottomin a 3 inch layer, because hampsters burrow. Buy a water bottle, a bowl will cause problems. A food dish, and fill it with hampster diet.
For exercise, get a wheel small or large enough for your hampster.
For out of cage exercise buy a ball (plastic), they sell these at pet stores.
Feed and water them everyday. Play with them often.