You will need to get two or more or you will have problems.
Goats need companions of their own kind.
Goats are social. They are herd animals. A lonely bored goat is mischevious and can do alot of damage. Make sure you have have tall strong fences and you may want to run an electric wire to keep them in.
Seriously. If you don't have a good fence system and a buddy for your dairy goat you will be chasing down roaming goats and wondering what in the world happened to put the dents and scratches in your car/ truck, what ate the garden, and where did the bark and leaves go on the tree out in the yard. Not to mention all the little poop balls decorating everything - and they don't melt and wash away in the rain either.
Someone said it perfectly the other day -
If your fences won't hold water they won't hold goats.