As other posters have mentioned, there really are no guarantees when you're dealing with law school admissions, namely because their primary focus is on the cumulative college GPA.
All that being said, there are some things you can do to improve your odds of admission:
1. Choose a major that interests you: My philosophy is that people tend to excel at the subjects and topics that engage them. Because law schools don't care what you select as your major, you have endless opportunity to choose a program that entices you. If you like it, you'll be more inclined to work harder at it- and that will likely boost your grades
2. Study Right: Master the art of taking great quality notes- they're the greatest resource when the time comes to study. Once you've built that foundation for study, you need to learn what habits work for you- whether you learn best by visual aids, by memory, or by hands-on experiences, and whether or not you can work in certain environments (ie noisy or quiet etc). And if you get stuck with any of the material, ask your prof or TA for help- that's what they're there for- to be a resource.
3. Write Right: One of the things that many prospective law school applicants don't realize is that a quality admissions essay can be a key deciding factor in whether or not a certain student is up to the law school standard. This is especially relevant for the elite schools like Harvard and Yale. Learn to write really insightful essays. A lot of colleges have these little essay workshops that can help you pick up some writing tricks that will maximize your writing potential.
4. Get Involved: Academics are obviously a fundamental part of the admissions selection, but one of the things that can help win over the admissions panel is extracurricular involvement. If you're active in your school and community, law schools will view you as a dynamic and diverse addition to their student body. Volunteer outside of class, join a team or club (especially something like debate team, student govt, or a mock trial team- they're very relevant)
Any of these suggestions could very well boost your chances, but like everything else in life- nothing is certain.
Where I live juvenile court judges will not allow a defendant to appear without attorneys. Your parents should be involved in this decision unless you are the parent. If you are then you need to talk to someone at the court and see what the customs are. No way to tell you about what any fine is.
Thousands of counties= thousands of different laws, etc.