New garter snake advice

[David339]

I have an eastern garter snake. I've had him about 2-3 weeks. I already have him eating frozen pinkies. I like to mix some earthworms or a frog here and there. He is aprox. 18 inches long and about 1/2 inch wide. Not sure if he's a he. When I first got him and took him out of the small container he came in, I was handling him and he kind of edged up on my arm and I felt a tooth but he didn't bite me. I thought he was acting like he was going to though. He ended up biting himself and had himself wrapped tight around my finger, I had to as gently as I could slide him off my finger. He isn't hurt, he's shed and such since then and no sign of injury or anything. Now that he's good and used to me and his tank I want to work with handling him. I've been giving him one pinky per week mixed with some worms and maybe a frog(have given him cricket frogs and newly transformed fowler's toads) during that week. The next day after feeding, I can't even tell he ate a mouse. Should I be giving him maybe 2 pinkys a week? He certainly acts like he wants another after a few days. Can I keep more than one of these in a tank? I've read you can and wanted confirmation. Going to start hand training soon. I have a bunch of fossorial snakes and green snakes that are better off not being handled often. Many years back I had an albino striped corn snake that was close to 6 foot long. He was already used to being handled. I've already ordered a hatchling one of these and will have to do hand training with him too. Hand training advice? I'm not scared of being bitten, but I'd rather not stress the snake out.