You have had some really good suggestions so far
It is a lot easier to work with a young puppy , then one who is an adult, or older. Now is the time to take charge. Because he is going to become a lot worse if he is allowed to continue he unrulely behavior.
PLace a gate , out of the kitchen, set boundaries , and be consistent . Also, to make friends with him, sit on the floor, and offer him toys, or treats. Let him come to you, and play with him. When you sit on the floor it is less threatning. Also, do not use direct eye contact. Talk in a soft voice, and we he is nice, tell him he is such a good little boy!
Do not be hitting him, or yelling at him, or showing any aggressive moves, because he will become defensive. Your little puppy may just not have had any social skills around people before you got him.
The more you give him your food to eat, the less he is going to eat his own food. Stop feeding him human food, and only allow him to eat his own food.