I cannot recommend a book or a blog, cause I don't know one.

But I can tell you: it is ridiculously easy to make friends at the university. Especially if you are all freshman, just go up to people and talk to them. Almost nobody knows anyone, nobody knows what to expect or where to go, so basically everybody is thankful for a friendly voice.
Exchange numbers, call the other person up and explore the nightlife.

There really is no big secret to it, just talk and be friendly, and sooner or later you will come across people with whom you become friends.