Do a worm count first, then for the milkers either Panacur (not that good, possibly already resistance), 8 day withdrawal for human consumption, or I have also used Oramec and not taken milk for 14 days (on vets advice, it is not licensed for milking goats/sheep). My vet has advised against cydectin (injectable, but good if you have resistance) for milkers, as in his opinion injectable medication is around in the body much longer.
Worm the in-kid goat just after kidding, as you will not want the milk for a few days anyway.
You will have to say you order it for sheep, as only Panacur is licensed for goats, but vet can give a prescription I think.
Also think about their grazing, clean or not?