Looks great! As for exposing the roots, I'd think about starting in a year or two. Some people kick off the process early, I usually wait a bit longer - am not sure it makes a big difference either way.
Once I do start exposing the roots, I begin by exposing just enough to where I can see the roots. If they are small, I stop there and let the roots thicken before investigating further. If they are a good size, I'll expose a bit more.