Check out PT blogs. Google them. One of my favorites is PT Think Tank. Browse a few blogs and look for themes that pop up frequently. You can never go wrong with issues like direct access, reimbursement/Affordable Care Act, evidence based practice + integration of clinical expertise, the doctorate vs. master's vs. bachelor's degrees, how the PT industry interacts with physicians and other health care professionals such as chiropractors (interventions and treatments that PTs/chiros/physicians/ATs should and should not perform/administer).
I think the APTA website has a list of current advocacy efforts.
Obviously, I don't think anyone on this forum is going to straight up tell you the "right" answers. You need to decide your personal stance on these issues.