When they are used to it, they will eat it out of your hand. You also have to provide them with lime blocks. They will eat these blocks. They drink a little bit more water than Mongolian gerbils do, so make sure they always have enough fresh water. As bedding material you can use saw dust or corncob, supplemented with hay and as desired with some nesting material like tissues.
Some people use sand as bedding material, but it is smelly, and rather heavy.
A good alternative is corncob bedding with a separate sand bowl. If you wish to use any pictures etc.