I started feeding my Westie raw at about 8.5 weeks when she came home.
Here she is enjoying her raw meal (I think at 10 weeks)
http://i17.photobucket.com/albums/b6...ride/003-5.jpg http://i17.photobucket.com/albums/b6...ride/011-2.jpg http://i17.photobucket.com/albums/b6...ride/006-5.jpg http://i17.photobucket.com/albums/b6...ride/010-2.jpg
About the kibble- raw and kibble meals should be given at least 10-12 hours apart. For this reason, I would not do 1/2 with a puppy. If you don't want to go all raw- consider using something like Ziwipeak or Honest Kitchen to supplement the raw that you are willing/able to do now.