"emergency recall" is another useful skill/command.  google "really reliable recall" or look here in the FAQ.  We had success with that without much effort:

pick a special "magic word" that dog never hears in casual conversation, don't overuse it, do refresher training.  Use the 'capturing' principle:  introduce it only when you KNOW the dog is gonna come running, no matter what yu do.  Lavish special rewards and praise (Al & Gwynn think "Venite!" means "bacon!").  Not your routine recall; this is for when doggo is about to chase a porcupine across the freeway traffic.  You want this to be the most fun command/game.

Al & Gwynn will actually forget their soccer ball and come running at this word.

I wouldn't think you could really over-walk a puppy with gentle, casual walking.  I'd think it's the impacts you want to avoid, but I don't know.  I never took either dog hiking until 1 y.o., but I'm sure Al was going multiple miles around the neighborhood when he was quite young.  Discourage leaps off furniture, down long stairways.

You're going to have plenty of time with that dog, no need to be impatient.

I do like mythical/astronomical names.  Our first was Sirius (Orion's big dog).

Spend a lot of time and effort on training now, it will pay off handsomely,  This cannot be overemphasized.

Knowing my hiking habits, our breeder was quite firm with me:  "No big physical challenges until 1 y.o."  The reason being mostly growth-plate injury, I think -- avoid big downward leaps; impacts might injure the cartilage growth plates in the long bones, principally the wrists.  The carpet is good; if you have smooth floors, provided nonskid throw rugs at takeoff and landing zones.  

He is so cute, I would like to grab him up for a good hug.

Welcome Paul, Carrie and Orion! Do you know about the San Diego COrgi meetup group? We have awesome fun meetups!

http://www.meetup.com/SanDiegoCorgiMeetup/