He's very pretty, reminds me of the cinnamon toast crunch cereal in a good way. I think you're already doing a great job letting him settle in, that's the hardest thing to do as a new owner and most common hurdle.
Whenever you're in doubt, less is more when it comes to hams. Make sure not to over clean, you do want to spot clean daily but leave unsoiled bedding and the burrows alone as long as possible. If there's a noticeable odor coming from one then it's time to clean it. They navigate mostly by smell, and need to get their environment marked with their scent. It's stressful if they have to re scent and dig all over again.
For bonding, other than getting them to take treats from you a few tricks that might help:
-Rub your hands gently in some bedding near their burrow and place a treat on it. Helps associate you with food
-Hamsters are territorial, some don't like you being in their enclosure at all. You can use a mug or 'hamster taxi' to transport them to a neutral area, it can make all the difference.
-Toys that have some level of indirect interaction help deepen a bond once they're used to you. My little guy loves his forage board, they learn fast you're the one setting it up and will associate you with fun in addition to food
Everyone here is more than happy to help, you will get tons of great advice and every ham is unique.