Learning how to care for a scarlet king snake

[Dillonps]

Today I found a scarlet king snake in my garden. To overcome my fear of these creepy creatures I captured it and made him a home. I lined it with Pete moss gave a little hiding home a watering spot and some branches to climb. Dose that sound like he will like that. I do not really know what to feed him. His head is so small that I doubt he can eat a mouse or lizard. Could I just grab a beatle or roach that she can eat. Also how can I sex the snake? Thank you for your time and any advice you can give me. I will release it if I feel she won't be properly cared for and happy.