Custom Appwizard Creation

I am developing a custom appwizard project and i want to change the project settings like making it UNICODE compatible.
How do i use AddToolSettings() and AddCustomBuildStep() in my mfc code? How do i send parameters. I know the declaration, but the calls are failing, but no compilation error. Also, how do i create a BSTR object and assign some string to it(Inside a custom appwizard project and not ole project).