Default Need BuildOS help

I was wondering. When I open buildOS if I do not check any of the OEM's will this just allow me to cook WM6.1 on my phone or is there some other way you have to do this? I just want to start off with a clean install of 6.1 anything else I would like to add as I go. Again great web site you all have here it has helped me out tremendously, and I thank you all for it and the help you provide.