I have a three year old son and I am wondering what I should be teaching

[YoursTruly]

him at home (scholastically) to....? help prepare him for when he begins kindergarden? (Even though he still has awhile) I became a mother as a teenager so I know that to many people that is a disadvantage for a child and I just want to do my best as a mom. He can count to 10 clearly and is now learning his numbers from 11-20. He can also identify animals such as cats, dogs and monkeys and make noises that represent that animal. He is in the process of being potty trained and is doing very good at that. He dances and sings songs from commercials and tv shows like Wonder Pets. He doesn't speak as clearly as a three old probably should so what can I do to improve that?, and overall what else should I teach him? Thanks a million times for any help that can be provided.