For this project, you'll combine two photos with Photoshop. You'll cut the person out of one photo to add it on top of the other. This is like using a green screen in a film, but you're doing it manually. You don't have to worry about copyright for this project, but if you want to publicly share your work, you should use legal images.
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Note: if you ever can't find a window or panel you're looking for, go to the top of the screen, click Window, then whichever panel you're looking for, such as Layers.
Also: if you get stuck, you should try googling what you're stuck on. There are soooooo many Photoshop guides - if this one is confusing to you, use Google as your personal guide! You can also contact me, obviously. Google will just be faster.