>>2858106To break them in, wear them. Around the house for a bit, then out for a few walks, then out for a few hikes. I don't have any experience with that brand, but the break-in period can be a bitch, so don't take them out for a long hike/walk the first time.
For care, every time you wear them outside, brush them off with a good shoe brush. Once in a while, condition them with something. I like mink oil for various reasons, but if you are in a wet climate you might need something waxier.
Congrats on the new boots, Anon.