Hey man, head over to the bar-barian begginers thread and have a read of that. It covers asome of what you're asking. Also check out the threads in the training logs section.

As to how often, long... simple answer, rest when you need to. If you can go 2 hours a day every day, awesome. Do it. If you can do 30 mins and have to take every other day off, awesome. Do it.

Only you know how much you can handle, so it's hard for others to say. If you are full of energy then train to your hearts content. If you just want to sleep for a week, then that's fine. Rest is important so don't feel that you must stick to a regime no matter how you feel.