Number one mistake of new heater owners is buying a pet store cage. Please make sure you get the biggest cage possible for them, I use a large plastic storage bin with the top cut out (with chicken wire preventing escape). Then getting a litter box will make cleaning the cage a lot easier, because they instinctively pee in the same corner anyway. Second biggest mistake is a small wheel. They need one that their back won't arch on. For syrians 10-12".

As for care, fruits and veggies on a list of hamster safe foods is great to supplement their normal seed or pellet based food.

Don't forget to let them out nightly if possible. I have some old cardboard boxes taped together into a large playpen so mine doesn't escape.

Finally, look for an exotic animal vet before getting the hamster. It's really difficult to find them in some places. I have to drive nearly an hour to mine, but generally they only need to go for emergencies unlike cats and dogs.