Yes!
Yes you need a Orders collection too! The short app that I created doesn’t have a Orders collection. It’s just simple. One day Boglex gave a offer to get one app free from all templates that they created! Not sure if that offer still exists! And I got that app! If you need to look I can send it to you via DM!
And I saw that Yongki also created a nice app and posted in the forum today! : Let's build Online Ordering App (clone-able)