1. I live in the California mountains, but I'm sure it gets colder for you (we get 10-20*F at the lowest) so I can't really answer that. I keep my rabbits in a shed outside even when it snows.
2. Start with one if you're really not sure. Or if you think you can handle it, start with a breeding trio and then choose to breed or not to breed when you feel ready.
3. I like my Frenchies so I'm a little biased. I chose French over English because the French have clean (un-wooled) faces, ears, tails, and feet. It just seemed like they would be easier to care for... and I like to see their little faces.
4. "Storey's Guide to Raising Rabbits" was good for general rabbit raising, but I found it to be geared more toward meat rabbits. Actually I found ARBA's "Guide to Raising Better Rabbits and Cavies" to be the most helpful. I haven't read anything angora specific, but the ARBA guide did have an angora grooming section.
5. I liked starting with sheared 6 month olds. That way I had 2 months to get to know them before they were even ready to be bred and with a freshly sheared coat, I had time to learn good grooming practices before they were in full coat.
Hope I helped a little. These were just my personal experiences and I'm sure you'll figure out what's best for you.