Good for you man. First off, quarantine him for 3 months.
As for caging, a large cage is fine assuming you can make him feel secure with perches, hides, lots of silk vines and plants and most of all, if you can keep the temps and humidity good.
As for feeding, how big is he? If the prey is too small, he might not register it. I know my JCP I got, I was told she only eats at night on live mice. I got her switched to F/T mice during the day in 1 try. The trick I did was I would hold the mouse with tongs by the tail. Then I would show it to her so she saw it. Then if she didn't grab it, I would just rub it on her body. That usually made her go crazy and she would grab it. Another thing that worked was same thing but instead of rubbing it on her, I would drag it along a perch in front of her and she would follow it and grab it.
Your little guy might need more time to adjust. Make sure all the temps and husbandry are good. Like I said, the gal with my JCP said she was a pain to get to eat but once I got her set up, she ate like a horse. She eats 2 adult mice every 5-7 days like clockwork.
What I have noticed with mine is she doesn't use hides and LOVES her perches. I can give you a few shots of her in her temporary cage until I get her Animal Plastics in spring.
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