Welcome to the forum mate, there are some wonderful tudor sub builds around. My advice would be to decide on a model and look into it. If you're starting from a movement you will need the case (perhaps look in the parts section of the forum for some great deals if something comes up), a dial (there are many different sellers on these, for a tudor sub the "cheap" option is usually yuki), hands, crystal and crown (there could be something else). You'll find a lot of build logs on this and the other forums. Good luck, welcome to the madness of rep watch building.