I wanna record directly from my guitar to the PC and i wanna know how to do that. I've read about plugging the cable into my amp (Phone/Line Out) and then to the computer into the line-in (blue). I've done that. But i can't hear any sound at all.. It's probably me doing something wrong but i can't seem to find out what it is.

Please help soon
It wont work because you dont have the proper amplification. You will need an interface such as guitarport/toneport.