Hi
How old is Elvis? If he's still a young puppy the biting your fingers is just playing, but you are right for discouraging it. Just tell him "no" like you've been doing, but then give him a toy to chew on and play with instead. Even the little growl when he goes for your fingers is just playing if he's a puppy, that's how he played with his littermates
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As far as coming out of the crate, Alice doesn't like to be "taken" out of her crate that she sleeps in at night either. The first week or so I had her, she wouldn't walk out of it either, I had to reach in and get her, but now I just open the door and out she comes
Idk why he comes out for strangers, maybe he's just more curious of them. Try using a small treat to get him to come out on his own, he should get over that soon