Starting Point: Development with WSS 3.0
· Install Windows Sever 2003 SP1 with IIS 6.0
· Install SQL Server 2000 / 2005
· Install Visual Studio 2005
· Download and Install .net Framework 3.0
· Download and Install WSS 3.0
· Download and Install Windows SharePoint Services 3.0 Tools: Visual Studio 2005 Extensions
· In Visual Studio 2005, create a new web part project, modify the code, and press F5.
https://msdn2.microsoft.com/en-us/library/aa973249.aspx
· Open your SharePoint site, and add the web part that you developed.
That’s it. Don’t worry about manifest file, webpart feature file. Everything is handled by the VS 2005 extensions. Code Happily. :)
To deploy your webpart in other site, open the project in VS 2005, goto Project -> Project Properties -> Debug option, change the URL value in the “Start browser with URL, press F5.