They're yours now. Any property the owner expected to take should have been taken before you bought the house or the purchase agreement should have listed the property as property he was going to take. It should have been gone when you moved into your home. It's abandoned property now. He has no rights to it. If the property is not of great value and he sues you, I'd give it back. In other words--think with your pocketbook on minor matters. If it's not worth the atty fees to keep it, be practical.
Civil litigation is a very broad generic area of law. There are many areas of focus within civil litigation, the most common ones being family law (divorce and child custody), personal injury and insurance defense. None of them pay particularly well but what you study in college is largely irrelevant and how well you perform academically in college is infinitely more important as your career opportunities as a lawyer are going to be dictated largely if not exclusively by the reputation of the law school from which you graduate, and the top ranked law schools are only concerned about the reputation of your college, your UGPA and your LSAT score.
Focus on what you what you believe you can excel at in college. If it is an area in which you can pursue an alternate career path other than law school, all the better so you can broaden your career options in general after graduating from college.
You should be aware that the employment market for new lawyers is extremely competitive and the salary distribution curve for those actually able to secure employment is bimodal with only about 10% or less of all law school graduates breaking the six figure barrier and the largest group of law school graduates securing full time jobs that pay $40-$60k. That's not the greatest return on an investment of $140k in tuition, plus another $60k in living expenses so you should make sure you are passionate about the practice of law before enrolling in law school.