Photoshop Add Person to Photo and Change Background

I was looking to have a few pictures with my friends on a Royal Caribbean cruise that we were going to be taking together to the Bahamas. I probably don’t need to be that specific, but in addition to grouping us together in a picture, I wanted to inquire about changing the background to beach, port, boardwalk, etc. I was looking to buy a few images. I know it’s a lot of work which I’m not sure if I can even be done. But please let me know if you are available to work on my project to have ready by Friday, August 13.

I can send a series of pictures to browse through to see if they would be compatible for this project.