H.S.
We moved our daughter to her toddler bed at about the same age. We just leave the door shut and she can't get out of her room to bug us. I don't go in there - sometimes she plays a little before she sleeps but lately she has started to actually go to sleep right away. She does not wake up in the middle of the night at all unless she is sick now. I think because she knows I'm not going in there so it's pointless. We have a moniter still in her room so we can tell if she is in trouble by her cries. Having been through this before with my son it wasn't much of a challenge this time around. Keep the door closed and if you do go in the check on him put him back in bed - tell him good night and don't give him anything to drink or eat. Otherwise he will think you will give him something and call for you.
We do put Ashley to bed with a sippy cup of water....only water. She never really drinks it but this way there is no reason for her to call us back in the room for a drink.
Hope that helps. My son is 10 and daughter is 2.