Finding a job is a good start, but don't get so caught up in trying to find a job to get an apartment or car or whatever and forget about college. Finding independance is great but don't let just getting out from under your mom cause you to get caught up in situation that prevents your from higher education and a good career.
A part-time job now will expose you to others outside of your limited scope of relationships. While your mom might be able to limit your association with school mates or neighbors, she can't influence your workplace.
But keep up the good grades, plan on college. And pick a college that requires you to leave home and stay on campus. That's your ticket to freedom. Use that 4 year plan to get a good education and then a decent paying career and you're set to go the rest of your life.
At 17, anything beyond high school graduation seems like an eternity but to secure your freedom, you're going to have to look at the big picture...posts high school, college and career. That's the path to work on.
Of course, your JW mom is going to fight you. It's going to be tough, to show her respect and love, yet be determined to go your own path. You'll realize it later, but it will give you character and strength and will become a life lesson on how to handle adversity.
Good luck...