Ehm dude...
FL Studio is a professional's Program that's used for complex studio activity. It's even way too complex on its own but with the customisations and the custom content one carries in it it's impossible to explain it just like this.
I posted two tutorials once, explaining some basic stuff.
http://stickpageportal.com/forums/showthread.php?t=75334
http://stickpageportal.com/forums/showthread.php?t=75337
That's all I can do for you like this. Other than that, learning by doing ;]
I also learned it without asking people on the internet, it's possible.