New here, just some questions!

[CarrotChunx]

Hi everyone! I just got my first cb garter on Tuesday! That said, I have tons of questions as a result of my pet owning paranoia.
From what I've read, this is all normal and fine, but it's been years since I've had my own pet, so the paranoia is hitting hard
1. He's new and I know he isn't used to me yet, but he seems to be becoming increasingly frightened of my presence. I'm sure this will go away, but any tips on how to get him used to me? We share a room, so I don't want to scare him every time I'm in there

2. The past two days, he's hid on the warm side all day. I also fed im before this happened, I hear it's normal. But doesn't he need to cool down?

3. He seems to be most active at night, exploring and climbing and flicking his tongue. Aren't garters diurnal?

4. I fed him worms on a paper towel, but he dragged it off and got some aspen in his mouth. He seemed to gather it all around the corners of his mouth and spit it out, but if he got a small piece, does that guarantee impactation? If so, how can I help? (feeding him in a separate tank next time, not worth the risk)

5.Last night i noticed he was rubbing his head on the ground/his log/leaves. He doesn't seems to be shedding yet, but he dunked his head in water prior to this. Is he just trying to dry himself?

Sorry for such a long list, but any help at all is appreciated. Thank you so much in advance!
Also, here are some pics of my new guy and his tank! He still needs a name so if you have any ideas, please share em!!