We recently adopted a 3-year old Hypo. He was thin also and had scars on him from live feedings (every 3-4 weeks!). He is about 3 1/2 feet and very gentle - we named him Doug. The first few times I went to pick him up I used a snake tong and after that my hands. He rattled his tail at me the first few times with my hands, but never struck, and now enjoys being picked up and exploring.
A couple points of advice (from a long-time reptile owner, but by no means an expert). Let him get settled in his tank before you attempt to handle or feed him. Give him at least 3-5 days to settle in.
Then you can try to feed him. I would not go as small as a pinkie, but a hopper might work okay. I went straight to mice because I knew he had eaten a live one in the past few weeks. He relished it! I would also go to frozen, but it sounds like you are going to anyway.
In terms of handling tips - be assertive and not scared. Pick him up, don't play around in the tank deciding should I or shouldn’t I. That's his territory and fear on your part will only make him more scared.
I have encountered corn snakes at shows that are not handled often and they generally dart around and rattle their tail sometimes, but rarely strike. Corn bites are not that bad first of all, and second of all - they rarely do it -especially once they get used to human contact and are fed regularly.
Here's Doug and Doug with my Fiance. We also have a lot of fish, an 06 Lavender corn, and a 06 Bearded Dragon (Orange/Red/Snow color morph).

