You shouldn't need to use moisture resistant board in a kitchen. Most kitchen cupboards would be destroyed by excessive moisture and with decent extraction there is no reason a kitchen would be any more moist than the living room.

1 if you want to bond the plasterboard to the wall buy a bag (or two or three, depending on the size of the room) of adhesive from your builders merchant.

2 as long as the wall is not damp you don't need to do anything to it. Plasterboard adhesive sticks like the proverbial!

3 I would always recommend you skim the plasterboard (and if you use MR plasterboard you need to use a primer first) but you can paint straight onto the board.

If you are not going to skim you will need to use feather edge boards and a proprietary jointing compound for all the joints.