IT is very challenging. And as listed in the preceeding post there are a large number of positions/position descriptions available. And most of those positions actually can be doing any number of things or even something else. Titles and job descriptions aside - no matter the discipline.
And, you will most likely start out in some support position - one way or another.
Start reading the employment ads and gain an understanding of what skills and skill levels employer's are seeking. Take a look at online job applications, resumes, do practice interviews, learn about job hunting in IT.
Visit a library and start perusing technical magazines, keep reading in forums such as this one, go online and learn about different topics. Start wherever you wish - you may need to back up a bit and learn more. In IT you will always be and will always need to be learning.
I have a growing sense that most job descriptions are now being written for two positions. I.e., they want to hire someone who will do the work of two people....
Employers want reliable, honest people who are willing to learn, show up on time, be a team player, and not cause to much hassel for their manager and co-workers. Take on some extra work when necessary. Show self-discipline and respect the work place environment.
And you will need a wider range of skills especially if you wish to move into management or senior technical positions. Take extra classes in technical writing, communcations/speech, math/finances. Learn to use software management tools. Not that important starting out per se but if you really want to move out of some "Help desk" support position (and you will) then you need to be able to bring more to the table.
Certifications may or may not be helpful. Watch out for training companies making lots of promises but rarely able to deliver on those promises.
Decide what part of IT you are most interested in: software, hardware, networking, security. Take the necessary classes but stay open-minded and flexible. You will (as in any career) need to pay your dues and do things probably not high up on your goals and objectives list.
You have an advantage - just asking questions is a good sign. Keep it up.