Hi, I see you want to create FB Instant game by using cocos creator.
As an experienced game developer, I have extensive knowledge of cocos, unity3d and html5 for over 6 years.
I am quite experienced with FB Instant Game, Wechat Mini Game development.
For Leaderboard and Gamebot, It is required to setup on FB developer account and FB instant apis like shareasync, getplayers, etc.
Please reach me to discuss more details. Would you like to share game design?
Thanks