I need to get normal distortion plugin or something to record distorted sound of guitar. If anybody know about something, that I can insert in FL (plugin or guitar processor of some kind), I would be very pleased.

There are plugin's for Cubase as far as I know, but I don't think they are there for Fruity Loops

fl takes vst dunnit. pretty damn stably as well. just type vst distortion into google.
edit: look theres thoasands
distortion google search
amplitude is the one i have heard good things about and i got some tube fuzz plug ins that i like. you wont have to pay any money though as there are loads of good freeware fx out there.