However, you might want to get a piece from a dog owner first and see whether your hamster likes it. Some owners complain that their hamsters ignore the biscuit completely and that the biscuits were a mistake. It'll prove useful to buy an airtight container which you can use to store the hamster's store-bought food after you' ve taken it from the bag or box. The compound food needs to kept dry and free from any growth of fungi or other microbes. Try to buy just enough for your hamster for maybe a month or so - this should be about the size of the packet anyway.
Some owners also take to storing their pet food in the fridge.
No, hamsters do not generally have a greater liking for sweet stuff. In such a case, you have to bring your hamster to the vet to get the substances removed. Your hamster will do great on his normal hamster food. Food containing too much sugar can upset anyone's diet.