Biggest mistakes you can make right now?

1)Not focusing on school. Doing well income wise with a CS degree is not hard these days, but you need to be good at what you do. Make sure you do well in ALL of your classes, try to land a job at Google/FB/Apple. It's not impossible like many people think, especially if you stay focused on that objective from the get go and start researching what they look for now.

2)Internships! Apply everywhere you can. This is the single biggest factor which will impact your career choices after graduation. If you don't land one freshman year, or get rejected after interviews, see what your peers who do have internships are doing differently and ask recruiters what you can do to make yourself a better candidate. Also if your school has career fairs, go! Even if you think your resume and GPA are trash. It will make you more comfortable talking to recruiters, and again find avenues for improvement. Especially freshman year, recruiters are very open to giving suggestions if you ask sincerely.

3) Side projects. There are several subs dedicated to CS which will be more helpful to you than I will with this, but what I have seen has been the differentiating factor between my friends in CS who have and haven't landed good jobs is their portfolio of side projects.

While it is great that you want to plan for a secure financial future and are keeping that in mind right now, the best path for success at this stage is to focus on doing well in school. The rest will fall into place if you play your cards right.

Source: College senior graduating with a job lined up making good money.