Camera Interface

I need help with starting a project. I need most of the application to be a class that controls the camera operation so i can easily modify the application. I would like the app to be coded in VB.net because that is what i am most familiar with. This project must be windows vista compatible and use MS SQL express. the app must be compatible with a Nikon SLR D90 Camera, the camera needs to be capable with an external flash and displaying preview video to the PC and when a button is pressed on the window form the picture is taken and transferred to the computer. The picture is then displayed on the window frame in a second box. The image will need to be saved to a specific folder then indexed in an MS SQL database.