Submit App with In-App Purchase

Hi all,

I am preparing to submit app with In-App Purchase. I know I have to submit In-App Purchase items for review. Before this, I always submit app binary through Xcode organizer (Archive). My question is I have to submit which one first? That is either submit IAP first or my app first? Is it my IAP will automatically submitted if I have submitted my app binary through Xcode organizer?

Sorry, this is my first time submit app with IAP.

Any suggestions are welcome. Thanks a lot.