The "staring like he wants to eat me" (or the dogs) is probably more like "staring trying to figure out if you might eat him."

Let the little guy have a week to settle in to his new home. While it is entirely possible that he'd eat now if you offered it, there will be NO harm to him to wait. On the other hand, offering food when he is too stressed to eat it will only add to his stress.

I see no harm in trying f/t the first time you offer him food. Some will take it right away even if they are used to live. If he doesn't take it the first time, then give him live until he is eating for you consistently, and then try to make the switch.

Your humidity is fine for now. After you've had him a while and you can see how it fluctuates over time, you may want to adjust it a little bit. For example, you may find the aspen is slightly humid the way it is packaged, but dries out a few days after you put it in the enclosure, so your humidity gets too low and you need to cover up a few holes.