so can they send me a viris without me even opening their message?
You'd have to accept a file transfer or something to get a virus.

And the flood thing, do they just have a bunch of ppl gang up on me?
NO. There is a program with which you can sign on with as many screen names as you want. And then they choose an attack froma drop down list and click Flood. Or Attack. And you get chat invitations, buddy accept lists, IM's, blank messages,error pop-ups, AIM icon exploits and such.