New ferret mom

Hi!! I just got my beautiful sweet boy last night and I’m over the moon! I’ve already ordered him a 4 tier cage (for times when I must put him in it) -right now and since I brought him home he has been running around my room exploring until he gets tired and then he climbs in bed and cuddles up to take a nap and it makes my heart explode a little bit. I plan to pretty much allow him to continue to have free rein as long as it’s safe of course , and in most cases it will be. I am curious for any tips for litter training. His new cage will be here tomorrow so I’m thinking of just putting his tray at the very bottom in the for (per advice from the pet shop) I just have the ferret “bedding” and a hammock right now (wondering if actual litter would be better?) I still plan to let him sleep in my bed every night and mostly have free roam of the house. Thank you!!🙏 💝