Based solely on the pic that you sent. It looks like you need to add more branches so he can utilize the full area of the cage. If not, your cham may start to climb the screen which could potentially rip out his nails.
Also, we strongly recommend that you put in live plants that your cham can hide behind. Schleffera or ficus plants/trees are good. If he doesn't have any place to hide, especially during this period of adjustment, your cham will stress out--which is terrible for his long term health. Also plants help keep the humidity in.
There are other recommendations that we can offer once you fill out the husbandry form. Congrats again on your new buddy!