Creating a RESTful web service and web service client

[dangermaus33]

I am learning Python and want to create a RESTful web service and web service client. For practice, I already create a simple python sales app that uses a database to store the items you can buy and then stores basic order info in another database. My idea is to create a web service that allows someone to access the order database and lookup order info.
I am using Python 3.9, PyCharm, and want to use Flask for the web stuff.

Any suggestions on how to approach this or links to an appropriate tutorial/guide?