Creating a sharepoint workflow

Hi, i'm trying to create a sharepoint workflow, i have the steps to create it, but, in the project types i dont have a sharepoint option, i only have the basics options of workflow, i installed Extensions of Visual Studio 2005, Share Point 2007, Share Point Services v3, Office 12 and I dont know if i need something more to create a share point workflow. Can you help me please!

[387 byte] By [HectorUrizar] at [2007-12-22]