Setting up VS Code
If you are new to extension development with VS Code and the AL language, you might want to practice this first. There are various resources out there, but a very comprehensive one, though not too voluminous, is Dynamics 365 Business Central Development Quick Start Guide, by Stefano Demiliani and Duilio Tacconi. Here is a link to the Packt page where you also can order the book: https://www.packtpub.com/business/dynamics-365-business-central-development-quick-start-guide.
Note
There are, of course, various other resources out there that can help you to get up to speed with AL development in VS Code. One of them is this comprehensive video, Best practices in Visual Studio Code development, https://www.youtube.com/watch?v=u24hyetS30Y, which also is to be found in this playlist: https://www.youtube.com/playlist?list=PL1FESh9FqyhQxkZXYYp1X1tTpXf3-9iSR.
VS Code project
In Dynamics 365 Business Central Development Quick Start Guide, Stefano Demiliani and Duilio...