don't handle it at all, you cannot tame these guys and you would need to have a big enough tank for it to get exercise on its own. I would suggest a pond for the long run but a large flat tank should do for one most of its life. Feed it pellets, fish, crickets, and mice and just about anything else you can think of. I have heard of them feeding on hot dogs before... Be ready for a big food bill since the eat non stop and go ahead and get a filter that is rated for twice as many gallons as you have and even then you will still need (bi)weekly water changes. good luck.
I have kept and raised 3 to be full grown as well as a ally snapper that is now 130lbs so I know my snappers. They are awesome turtles (one of my favorites) but they should not be taken lightly, they are a huge responsibility. Just something to keep in mind...