I saw many guides online but I didnt find what I need.
State here your needs
On my database is stored a table with orders ( order ID, date of the order, Client ID, Product ID, address of the client, telephone of the client). I want take this data and show it in the app sequentially with a button for every row that call the telephone number of the client.
You can make json api for your mysql data. And call it by using web component to add items to list you want
There is a php script with the kodular blocks that connect to your bank and return csv. The link that explains everything in detail is this: App Inventor Tutorials and Examples: MySQL | Pura Vida Apps
This might also help you
This is also Very good.
From my point of view this is the best way.