You will have to sift through a large amount of information from a wide variety of sources. Keep a notebook or file folders of the information you collect. Keep copies of cover letters, contacts and job descriptions for future reference. Use your academic talents here. It will take longer than you think.
Persistence is the name of the game in finding the right job.
Persistence means being willing to go back to places you've already been for more advice or to see if new openings have appeared. Particularly if you are searching for a job in a field that is new to you, you will need to spend a lot of time just understanding the field and what role you want to and are qualified to play. The conversations and research that help you define what job you really want to apply for are critical parts of the search, but often take a lot longer than people predict. Start your thinking and researching as early as possible and try to work at your job search consistently. You will have to be creative.