So you're wondering how to take care of a doe and milk her? There's a really good website: www.sheepandgoat.com
that can give you most all the information you could want.
DH and I had a mixed herd of sheep and goats, and while I never bothered milking the sheep, we did milk two of the most docile goats. We LOVED their milk, as did DD. The thing about keeping your own goat is that you will be strapped to her during the period of time that you are milking her. So unless you have SUPER sweet neighbors and/or family nearby, you can nix any kind of travelling (even an overnight trip). We milked our two while they were still nursing, but that still required one large milking in the morning. If they were not nursing their kids (which happens after a period of time...the kids discover the joys of grazing), then we needed to milk them once in the morning and once in the evening to keep their production up and keep their bags from developing mastitis.
Goats have an incredible nack for finding ways out of their pen...we had them going under, finding the crack between the gate and post and getting through there (at least their heads), and had one doe who was notorious for climbing whatever fencing stood between her and whereever she wanted to go.
Watch out for horns. With a gentle doe, horns are not an issue. But we've come across a few who would use them with a not-so-nice purpose in mind.
Even though you might think it cheaper to have a buck...they are SO not worth it! So you'll need your doe bred by a nearby buck or can buy an AI kit.
Goats are herd animals...it's good to have two as they get into less trouble than being by themselves, although I've heard of goats doing fine with the owner's dog/cat/duck around.
That being said, a well-behaved and sweet-tempered doe is a joy to have around!
Hope that helps.