You have basically two choices: either you get permission to put up your own poles / get permission to hang your cable on somebody else's poles or you get acces

You have basically two choices: either you get permission to put up your own poles / get permission to hang your cable on somebody else's poles or you get access to the public right of way / get permission from the landowners to dig up / trench / bore your fiber into the ground. As to the actual mechanics of laying fiber, there are whole industries dedicated to this task. If you want more detail, you'll have to be more precise.