There are now thousands of discussions on managing space on Android phones. When you install that SD card NOTHING HAPPENS AUTOMATICALLY and you are forced to research and learn Android's view of where your files and apps are.

So to clear this up you change where your photos and stuff is and I CAN NOT ANSWER THIS since how changes with each phone. I can point to the web, you can check out prior discussions and then try moving apps and files over.

There is no step by step because there are dozens of Android versions and thousands of phone models out there. You read tutorials and then try.