To get into IT you're going to need certification until you can get experience. The base certification is CompTIA's A+. Next up would be CompTIA's Network+. While A+ should be enough to get you a Help Desk job the Network+ is good to give you a better understanding of how a network fits together. Both of these should be considered foundation, neither is everything you need to know, just something that you can build on.
Once you're in IT you can decide what direction you want to go and get more certifications or training to meet those goals.
I can recommend the TWiT Network's Security Now! podcast. You can find the old podcasts archived on GRC.com
What you will find out as you advance is that what you need to learn for certifications may conflict with how things actually work in the real world. It makes gaining additional certifications once you have experience more difficult as you have the test answer and the real world answer.