It's great to see that you've found a passion Law and you're also excited about making movies. I take it you're transferring to a 4 year college next correct? The beauty of law school is that it accepts all majors regardless. If you are moving on to a 4 year programs, I'd recommend seeing if you can double major or minor. You can take prelaw classes and film studies as well. If you are serious about going to law school, also recommend you take a logic class from the philosophy department which will be very helpful to get you into the mindset for taking the LSATs.
Honestly, it's very early to worry about making career decisions and its seems you've set up a false dichotomy. You should continue to explore both. Look for internship opportunities at both law firms and film studios and see if you can get sense of what's involved into both careers. I'm not super familiar with the film world but I know its takes effort and luck to become a film director. While you can't control luck, you can control effort and you should be writing scripts, creating shorts, editing movies and build a portfolio if you haven't already. College classes will certainly film refine your skills, but if you're passionate, there's nothing stopping you from producing your art. Find friends who are also passionate, pool your resources and make your art! There are many career in the space of filmmaking. You should look into editing, visual effects, lighting, and the other aspects of filmaking outside of writing and directing as well during your career search.
On the law school side, it can a high risk high reward scenario. I have a friend in corporate law who made high six-figure salary after graduating law school. But he also worked extremely hard both in undergrad and in law school. He did well enough on LSAT to get a scholarship to a lower ranked school which chose over higher ranked school with no funding. At law school he was single minded in his efforts to get a job in big-law. He worked hard to get on the law review and be the editor, applied for and completed an internship every summer, attended every networking event and finished in the top 1% of his graduating class. Law school is a commitment and has many great upsides.
Honestly, its a bit early to be worrying about the cost of law school. I'd suggest first looking for opportunities to intern and get a sense of the legal world. If its something you want to pursue, work hard to keep up a high gpa and get good LSAT scores. Worrying about choosing to move forward with law school when you actually after law school admissions offers in hand. Until then, put yourself in the best place to succeed by getting good grades and experience.