Hi Abby!! Welcome to WeddingWire!! I'm pretty sure Google has a feature where if you put a bunch of pictures into a folder, it can automatically make a little slideshow with it's own music. I would check in to that, because the one time I know it was done, it was on a phone, but it repeated itself and it was cute.
Hey Abby!! Macbooks usually have iMovie which is a great app to take pictures and turn them into a video. If your computer doesn't come with it it can be downloaded in the app store. You can also try the Microsoft Powerpoint app.