2D Camera sizing and movement

Hi all,

Apologies if this is a basic question, or been asked a 1,000 times in the past...

I'm new to Unity, and having problems understanding some of the basics to do with 2D cameras (orthographic), and while I've read a lot nothing has made me have that 'ah-ah!' moment yet.

What I'm trying to create is the following (camera position depicted by the box with the pink dashed line) - where the yellow filled boxes are made up of a whole bunch of sprites.

Overtime, the camera need to move left to right, and then bottom to top...

What my issue seems to be is understanding how I can get the camera to display all of the sprites - in other words, resize the camera view to fit the background sprite's height, and know when to stop the camera in order to start moving it up.

What I'd like to understand is how and why to solve this problem - it's the only way I'll learn!

Thanks

Kieron