Great questions. It's great you are starting to consider these things now. To answer your question regarding a reasonable salary, according to CNBC the average annual salary for 2019 college graduates is $51,347.
Keep in mind this will vary depending on a variety of factors such as your location, company, position, etc.
Regarding long-term potential, here is a chart of the highest paying jobs with a bachelor's degree as well as a separate chart for an associate's degree with early and mid career pay for your reference.
As you can see, the salary range and long term potential are going to depend on the type of degree you obtain and major your pursue. That said, salary is not the only factor in a career. I suggest you choose your career path with your interests, passions, strengths and weaknesses in mind.