How to trasfer my PDF documents to ibooks on iPad

I need to sync by PDF documents to iBooks app. I just need to synch these books alone as in I don't want to back up my app or any other synching from PC. Can someone please tell me in detail ( I am a layman) how I could copy my PDF books via iTunes to iBook's ( I am not interested using the internet for this)

I just want to only sync my PDF from PC to Ipad.

Thank you