What you should know to start Developing a Database Software Application using Visual Basic which has to work on a Client Server network

Basics of Visual Basic and SQL Server
Basics of the domain you want to develop the application for.
For example of Accounting domain or Inventory Domain.
Basics of Client / Server Application Development with Visual Basic ( visual basic ) and SQL Server or C# and SQL Server
Knowledge of how to install a Network Operating system.
Knowledge of how [...]