Here's some sprinklings of stuff:
Bachelors: In most places this is equivalent to what a high school diploma used to be. Required to get in the door for basically anything that isn't entry-level menial bullshit or the sort of thing you'd go to trade school for. More importantly, it's a way to make connections in academia to further yourself when you got for a Masters and maybe a doctorate.
Masters: The biggest jump in potential earnings between levels of education comes from the Bachelors to Masters step. Going past this for a doctorate will just give you more debt while only opening up long-term investment in a professorship as new job options (which is, itself, heavily demanding and often not very rewarding), unless you're getting a vocational doctorate, in which case you're going to have literal mountains of debt but also a license to print money.
Doctorate: See above. Vocational = tons of debt, very high pay potential; all else = you are now either a professor or horribly overqualified for your field of work.
If you intend to go beyond the Bachelors, make sure to make contacts. Find professors that like you, make sure they remember you, especially if you're going into their field/attending the same university for your Masters.
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For CIS in particular I don't have any special advice beyond what Truean said: learn the commonly used programs, languages, systems, &c. in the field and/or specialization you're aiming for. In a field like this that tends to feed more into the workforce than doctoral programs, definitely continue to make contacts. Your professors in a Masters program are typically going to be well-regarded members of the profession, and many such professions are small enough that personal reputation can easily carry you from the classroom to the office, and later from job to job. 80% of getting hired is who you know, who will vouch for you, and experiences/friendships that relate you to the hiring staff.
That's what everyone says for good reason: networking networking networking. Also learn good habits for interviews, post-interview contact, personal and distance communication, and body language. It doesn't matter how good you are if the people you need to impress don't know you from Adam and get bad vibes from talking to you, exchanging emails, or just seeing how you position yourself when you sit down.