So, as a first time dog AND puppy owner AND a very "by the books" type of person, I'm finding that I would really like what a typical schedule would be for a puppy (now 12 weeks). I currently stay home all day so I have no schedule of my own, meaning a lot of my (somewhat anxious) attention is focused on Nellie. I know raising a puppy is more of an art rather than a science, but what would a typical day look like for a puppy that young? Right now I do a variation of:

get up, go out, breakfast, go out, a bit of playtime/outside time, I put her back in her pen while I compose myself and log on my computer for a bit (she typically naps at this time, for about 1-2 hours), go out, playpen play/training, then I crate her for a bit while I do something else, go out, crate while I go to the gym, go out, then some out of the pen time at night before bed at 11.

Is this too much time in her pen/crate? Should I let her out more? Our house is really big so it's really hard to puppy proof, and I'm not in the best of health to be running after her all the time -- plus she gets growly, grumpy, and snappy if I pull her away from things too much. If she's out, should I just put her on a leash and observe her exploring instead of letting her zip around willy nilly?

Thanks!