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I have been in a similar situation when I started my PhD on a completely different topic, but involving networks. I read two books which helped me a lot in terms of getting ideas and understanding basic theoretical frameworks.
The two books:
Easley, David, and Jon Kleinberg. Networks, crowds, and markets: Reasoning about a highly connected world. Cambridge University Press, 2010.
Jackson, Matthew O. Social and economic networks. Princeton university press, 2010.