How do I start? (+ how to get scholarships?)

I'm currently a junior in high school, 17F, and I'm interested in doing ROTC in college and eventually going on to law school. I'm just not really sure what the requirements for it are, or what my next steps are for joining. Do I talk to a recruiter? Or just my school college councillor? 3.8 GPA, good extracurriculars, 1460 SAT. I'm also not in fantastic physical shape right now, but I'm starting to get back into shape as of recently and if I keep it up I hope I can do it in time. I just don't know what the first step is, and what I should to to secure a scholarship, any advice would be super helpful!