You'll have an easier time learning the system and getting assistance if you target specific aspects of the system. ie: Help creating a character, help with combat mechanics/tactics, help with spellcasting, help working with roll20 in a PF game, etc. Otherwise, as Zzan T linked; the rules are there and available to you. Ultimately, you could really just read the book front to back or use the SRD to look up specific topics.
