For deep research there is the Storey's dairy goat book
http://www.amazon.com/Storeys-Guide...keywords=storeys+guide+to+raising+dairy+goats
This one was ok but not really fun to read:
http://www.amazon.com/Raising-Goats...TF8&qid=1434118711&sr=1-7&keywords=dairy+goat
Then the rest I got from the Johnson county library. I actually enjoyed the smaller books more as they were more at a beginner's level. Sure they may not have info on that 1 in 1,000 odd ball thing to pop up but I haven't needed that since I have a vet. Once you get a goat or even before you get a goat, find a vet in your area that will make house calls for goats. Talk to some horse people or I can pm you my vet's name. There is a fee for house calls but sometimes moving a goat in need of care is not good. Birthing for example, if the goat was struggling you would not really want to relocate it and have to deal with a stuck goat kid on route.
Then make sure you are good with needles as goats need meds and it saves house call fees to do it yourself.
As for letting goats just be free and not providing for their needs, maybe that works if the property is full of everything in just the right amounts and empty of the bad poison plants. But I'm thinking that a house rented to a young person and a few roommates is not set up to be a perfect natural environment for raising and caring for goats. And honestly as fast as their hoolves grow they would need a lot of hard rocky areas to play in as well as areas for food. There is a lot that goes into caring for animals. And just because there is a small percentage of people who say they do it without buying anything or for very low cost, that does not make it the best way for everybody else.