I don't have dairy only beef but I can tell you about my childhood. My step dad had three cows that I remember him milking. All were a different breed.
"Browny" was an all white cow (don't remember the name of the breed) Then he had "Irene" she was a Jersey. Can't remember the last cows name only that she hated my step brother and rightfully so. She had horns and a temper to match. She was a mix breed. So my first thing to say is get a cow that has been dehorned. http://www.ansi.okstate.edu/breeds/cattle/
2) calves transfer bacteria to the mom and they can get mastitis, so my step dad said. So the calves were always bottle fed.
3) dairy calves are steered for a reason.
Yes they can be raised for meat. We ate our bull calves. I'll never forget those boys. Us kids even gave them a name.
4) We kept the horses and cows pastured together but when it came time to grain, the horses went to there stall and the cows in their stanchion. Cows are smart animals just like you have your favorite seat at the table they know what stanchion is theirs.
5) I'm going to have to go with yes on this one. But with any herd animal they like companionship. I remember my step dad calling the cows up from the lower pasture "come boss come boss come bossy" and Browny always lead the herd back to the barn. She was called the lead cow.
6) If you don't want her to dry off then milkings have to be fairly consistent. My step dad worked nights so he milked around 9am and 9pm 7 days a week. By having three cows we had milk year round. The calves always came first. What was left over came into the house. In the winter mom would skim the cream off the top and make homemade ice cream.
Most of the time it was turned into butter.
7) That depends on where she is at in her production. They taper off as they start to dry off ready to calve again. That's another thing. The cow has to be bred back every year.
Owning milk cows is a lot of work but it can be very rewarding. Today I prefer to milk a goat.