Hello and welcome

I can see why you called him Milk

He looks so happy and excited himself there. He is adorable. Your enclosure looks wonderful.
My main tip would be to give him a couple of weeks to fully settle into his enclosure without changing anything round or any clean outs (maybe spot clean any pee after a week if you can find/smell it! If not I wouldn't worry).
Adding the odd new thing is usually accepted fine as long as it doesn't mean moving things around or taking something away. They get territorial quite quickly!
After a couple of weeks you could start with some out of cage time and socialising. Unless he shows clear signs of wanting to come out before then. He must be so happy with his lovely environment
I can't wait to hear more about Milk and his progress.