Hello and good luck with getting your store ready. You don’t necessarily need to add any apps to your store if you don’t wish to do so, but there are plenty of valuable tools offered in the Shopify App Store.
A lot of those apps will help you to make your work easier as well as enable you to enhance your overall customer experience. One of the apps that you could check out is HelpCenter App - it has 3 main functionalities.
FAQ Builder - easily create an FAQ section to your store.
Helpdesk ticketing system - make communicating with your customers more organized thus much easier and convenient for both sides.
Live chat - have real-time conversations with customers.
Once again, good luck with setting up your store and finding the right apps that will make the processes more efficient.