I would imagine that you could milk most any breed of goat. The question being how much milk will you *get*? The "milk" goats obviously produce more milk, the pygmies much smaller amounts, but quite possibly enough for your needs, depending on what your needs *are.* Ask about her dam...did the owners milk her at all? If so, how much did she give? How about the buck's dam?
As to what breed they are, check their size, too. The coloring and stature of a goat is one thing, but the size is a big (pun intended) indicator, too. Ears can help.
You say that the buck is a head-butter...does he have horns, then? How do you feel about that? Consider what you will do with the young ones as to whether or not you will disbud them, too. There are pros and cons to both.
If you are familiar (as a Vet Tech should be and Vet Assistants learn fast (I'm a former one myself)!

) with running fecal samples, I would not worry about deworming unless there is a heavy parasite load. Test the goats every month or so and just see if they *need* it. If so, deworm them and then again in 21 days to get the rest of them. I use Hoegger's Herbal Wormer weekly in their feed and so far (in almost one year of owning goats) have not had a single problem with parasites. I have a Nubian and a Saanen.
Feed. As a doeling, just good alfalfa hay, loose minerals and salt, plus baking soda, free choice, until she is ready for breeding. Then SLOWLY add some good grain to get her into condition, give a Bo-Se shot (I think a couple of weeks before? Someone remind me...), and make sure she's been tested for CAE.
I am big advocate of not medicating unless there is a problem. No medication in their feed (never had a problem with coccidiosis, though I keep a close eye on things to be sure so I can treat it if it crops up), no automatically giving antibiotics the second something strange shows up, etc. Fecal testing, blood samples, and keeping a very good preventative eye on how things are going have been my best friends lately. Treat when needed, not "just because"...
My own 2 cents' worth.
Sarah