I would first learn to secure your own PC first.
Download / buy and use:

Firewall : http://www.google.com/search?sourcei...F-8&q=Firewall
Anti-virus : http://www.google.com/search?sourcei...-8&q=Antivirus
AdAware SE : http://www.lavasoftusa.com/software/adaware/
SpyBot S+D : http://www.safer-networking.org/en/index.html

Optional extra's :
Swattit : http://swatit.org/download.html
Registry Mechanic : http://www.winguides.com/regmech/
HiJackThis : http://www.spychecker.com/program/hijackthis.html
Intended for advanced users. Be careful using this tool ................

The list goes on, these are the items I use.
When you feel confident that your own set-up is secure, you will feel more confident about working with, and helping to secure other peoples systems.

And read ..........read as if your life depended on it.
Buy books on subjects that appeal, as it makes the reading easier.
As you advance, buy books on subjects you need. Anything that makes you more marketable [getting and keeping a job is a major reason for your interest in IT security, right ?]
Has to be a good thing.
By the time this has all happened, you should be in time to retire peacefully.

As for the 'English' part :
you will come to see certain members *cough nihil cough* speak their own language
After a few months here, you'll find that nihilish [TM nihil] makes more sense than some of the other gibberish that gets posted.

books to start:
Hacking Exposed series : http://www.hackingexposed.com/
IP Routing : http://www.samspublishing.com/title/0672322102
Troubleshooting MS Technologies : http://www.holbornbooks.co.uk/details.aspx?sn=1245852

For when you start to 'advance' :
Mastering the Windows Registry : http://www.amazon.com/exec/obidos/tg...20168?v=glance

This is a personal choice, I've stayed with Windows, as that is the majority of the systems out there today. You WILL find better books and ideas, Don't disparage any, until you find the path that suits YOU.

Enjoy it here at AO.

And for when all that reading gets too much :
http://www.bausch.com/us/vision/prod...s/computer.jsp