Hi poogie.. they will wear themselves out pretty quick at this age.  As he gets older he will have more energy.  I hope when you mean "walk" you are talking about in your yard and not outside where other dogs have been and exposing him to parvo and other diseases when you are in the vaccination process... if you haven't already please read the information I provided on this thread regarding parvo: http://www.gentledoberman.com/forums/doberman-pinscher-discussion/doberm...

You can easily start training at this age, he just may not fully understand everything.  You can teach him to sit and lay down just by taking a treat and guiding him into the positions and then rewarding with food.  You don't have to add verbal commands to this just yet, it usually just confuses them.  You can start playing tug or short plays of fetch.  You can start playing hide and seek in the house with yourself while someone else holds him and then make noises to encourage him to find you.  THEY LOVE the mental games just as much as the physical ones.