Creating .WSP for SharePoint 2007

How to create .WSP for SharePoint 2007

Visual Stuido 2008 and SharePoint 2007
I am working on an exisitng VS 2008 solution. I got pre-set up server for share point, I have no idea how the previous contractor created .WSP, they said, just run .bat file.

here is the code for my CreateWSP.bat
@ECHO OFF
ECHO Copying DLL ...
xcopy /y "..\bin\debug\test.dll" .\80\BIN
xcopy /y "..\bin\debug\test.dll" .\GAC
xcopy /y "..\bin\debug\test.pdb" .\80\BIN
ECHO Running WSPBuilder ...
.\WSPBuilder\wspbuilder -wspname test.wsp -BuildCas false -SolutionId 567g7err.....
ECHO Copying WSP to Setup ...
xcopy /y "..\WSP\test.wsp" ..\Setup