High school senior

Hi guys I’m a high school senior about to graduate in may and considering entering the law field . I have a couple questions to ask if y’all don’t mind . 1. Specifically for criminal defense attorneys since you guys are always defending criminals has your ethics/morals code changed from when you started 2. Do you ever decline certain cases if so why? 3. What are some characteristics you believe all good lawyers should have ? Do you truly think the legal system is fair why or why not ? What are some tips to being successful in law school Thanks for answering 🙏🏾 😊