Upgrade my Videos !

I have have made 4 Videos. 3 of them are just under 3 minutes in length, and the 4th is 4:36. I've used these self made videos ( powerpoint converted to video) as a teaching tool for my young ESL students. I'm hoping someone can take my concept, and make it much more professional looking, even change the whole look of it. I have some ideas in mind. But hope someone with some creative talent can suggest some great ideas !