Web-part development  and deploying is a step-by-step process.

SharePoint Services 3.0: Visual Studio Server Extensions

www.microsoft.com/.../details.aspx\
-8c6dcbdc1057&displaylang=en

the above link is useful for web-part development, since that setup provides
functionality like web part project type and automatic deploying to specific
sites.

VSeWSS templates do not follow accepted best practices and and not extensible. I
strongly recommend against their use for anything other than reverse engineering
usng the Solution Generator.

These article may be helpful:
msdn2.microsoft.com/en-us/library/ms964439.aspx