Everything's negotiable. That doesn't mean you'll get it, but it is negotiable. First, think of what is important to you. Make a personal list of what you must have vs. what you want in your first job. Decide where you can be flexile, but also know the issues that are deal breakers for you.
Let your personality emerge after you understand the practice and have made some contribution.
Research can help you decide which field to go into and is a way to develop a list of your target organizations. Then you will decide how to contact them, and you'll measure your progress against your list.