Raw will be the same for kittens and adults so you will supplement the same if you decide to make your own. The commercial raw, like Darwin's, is already supplemented. Darwin's offers raw for both dogs and cats. The cat formula is for both kittens and adults.
There is no specified amount to feed since it varies by age and activity level. For the 1st year, kittens should be allowed to eat as much as they want unless there is a weight issue. Witchy posted great advice as to how to slowly transition the new food.
If Neo cleans his plate and still acts hungry, increase how much food you give him or increase how often you feed. If he leaves food left over on his plate, you can decrease the amount. Your kitten is the best way to learn how much food to give them. They have a way of letting us know if they aren't getting enough food. I read somewhere (can't find where) as a general guideline you can feed 1 ounce of food per pound of cat. So if Neo is 9 lbs, that would be 9 oz of food. Growing kittens that have a high activity level can eat much more than that so it's definitely not a set rule. Most likely, Neo will eat more than that.