Mobile App Resources Needed?

We are looking to make a mobile application and this is our first venture into it.

The company uses primarily MS products (O365/Azure).

Currently we are utilizing Azure Repos. The app is planned to be on iOS & Android as well as eventually accessible through the web. It will need access to a DB for storing, tracking, and serving information of course.

I am wondering what Azure things we are going to need and best practice to eventually push this app out and have it working.

If there is anything else you need to know please ask, as I said this is new territory for us. 🙂