>>1. caging. more vertical than horizontile for branches?
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Branches should be horizontal. Forks are good.
>>2. temps and humidty. warmer and wetter, like the amazon?
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Low 80's day with a warmer basking spot, high 70's night. As humid as you can get it without being wet. Spray more during shed cycles if needed.
>>3. feeding. ive heard they have higher metabolisms, feed 2x a week?
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No way! Feed them every 10-14 days and they'll be perfect. Some of my adult males only see food every 3 weeks or so.
>>4. handling. i enjoy handling my snakes(kings and pituophis). will i need a hook and thick leather gloves to handle him/her everytime? can they be tame enough to freehand?
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Get yourself one (or 2) of those mini-hooks from tongs.com. It's the greatest thing since frozen rodents when it comes to handling arboreals. Save the gloves for the garden. Many of them can be freehanded but most will require the hook for initial removal from the cage.