The routes which you will be cycling on are the ones which I have cycled through multiple times, have seen the navigational options, have seen them in different weather conditions and thus have fixed the best options keeping in mind the challenge and experience aspects of the ride.
So, things like food breaks, photo points, climb lengths, easy and difficult and maybe technical parts are all chalked out. Hotels for stay are places which I have stayed in and know to be convenient and comfortable. For the halts I like to choose locations from where the start next day is comfortable.