Yep you most certainly need AT LEAST two

(really two will do) never one alone, they are herd animals too.
Also- maybe just plan on getting what you get, the doe may only have one kid, she could have two, and dont get your heart set on a boy or girl, because you may not get it in that breeding. Wethers (fixed males) make fantastic pets, usually pretty easy going and agreeable (of course there is the exception) does are also great pets, and of course you have the option of breeding her down the road (there is a huge market for pet goats -among other purposes-, believe it or not!)
They do great in the winter, they need a draft free dry place to stay, we have large doghouses and some 3 sided shelters and bed them up with straw in the winter.
We clip our goats in the summer, but that is not needed, they will shed their coats just like horses do. We clip ours because we intend to show them, and we need "fancy" pictures of our goats for to put on our website.
Warning- goats are addictive!
We started with two- we are up to over 30 now I think.....many more on the way too! We breed/raise Nigerian Dwarfs.