You will need a good substrate to cover the levels of your hamsters home. Woodshavings are widely available but avoid pine and cedar as they are not good for your hamsters health.
Place between 2-5 inches of substrate on the main floor, hamsters are natural burrowers and will want to dig their way under the shavings. Dwarfs will often nest underneath the substrate so try find something firmer than woodshavings for them.
You will need your water supply and food bowls ready for your hamster, try to keep them in the same place and don't worry when your hamster moves all of its food to another corner, this is perfectly natural behaviour.
Bedding will also need to be placed inside the cage; do not use a cotton material as this can be extremely harmful to hamsters, use shredded paper and toilet roll instead.