below goes video, which describes on how to get started with Acumatica development:
In that video you'll find out:
1. How to install specific Acumatica build
2. How to debug C# code written by you in Visual Studio and Customization designer
3. How to get possibility to debug Acumatica source code
4. Default user name and password of Acumatica instnace
And much much more. Please watch and support with your likes!