1- Reraise to $1 or so and bet flop.
2- Standard at most lower stakes. Someone will call with any A
3- Depends on the player. He could just as easily have a flush draw as a set/boat
4- I'd lead out with this many in the pot. It builds a pot nicely for when you hit.
5- I'd be inclined to reraise him. Watch out if he calls and a club hits the turn though.