If you have never used a Raspberry Pi it is a small computer that can be used to make many neat projects like a retro gaming console.
Instructables has a great class on learning the Raspberry Pi. This class takes you through all the beginner steps and makes a photo booth.
The main components you will need are listed below. You could use a larger screen if needed.
You will also need a mouse, keyboard and HDMI cable if you don't already have those. See the Instructable for a complete list of items needed.