Welcome to the forum.
You should have a great time with this new machine. Breakin? I'd ask the dealer for guidance, and follow his advice. But if me, I would not set it at high throttle and run it for long periods of time wide open. At first, I'd vary the rpm and do some light chores with it for a few hours and work up to steady rpm's after 2-3 hours. I don't think you have a lot to worry about, if you follow the dealer's advice.
Dozing? Not in the typical sense, as you didn't mention having a blade. But loader work will be a breeze with this machine. With the weight of the hoe, I suspect you will be impressed with the dirt you can move with it and the bucket.