Hogwarts express ride footage recreation

Hi all, Im recreating the ride footage used at Universal Studios Orlando on the Hogwarts express attraction.

Im not a newbie to blender but will definitely be asking questions on certain points so im hoping yal can help me. For example, my first question is how do i control the speed and length of an animated camera path? As currently i cant find out how to control as i want the camera movement to be as smooth as possible.