Wow, you certainly want to learn a lot!

I commend you for your thirst of knowledge, but honestly, you're being very vague. What exactly do you want to know about "virii" and "firewalls and stuff"?

My suggestion is to sign up for newsletters, especially bugtraq's at SecurityFocus

Oh, and I almost forgot. Your name tells me a lot about your ventures. Please, read Gore's excellent article: http://www.antionline.com/showthread...hreadid=245746

Good luck, you've came to the right place.