I don't have a wonderful personal tutorial, or lots of pretty pictures. What I do have is this link. It will take you to a very easy to follow tutorial on making rice cereal. They recommend using a coffee grinder, but you could use a grain grinder, Magic Bullet(c), or even a blender.
The entire website is pretty helpful for those you wanting to make baby food at home. Though buying baby food off the shelf is pretty handy too!