Adobe After Effects: Merge 2 templates, add music

Hi, I have a small Adobe After Effects
job.

I have just started using AE and need some help. I have managed to add pictures to this template https://videohive.net/item/book-promotion/20885462

but I need to add some additional pictures (Pages/Pictures) to be thrown in the beginning of the video.

1. Please add pictures to https://www.pond5.com/after-effect/54321977/stylish-photo-throw-intro-photos-gallery-slideshow-presentat.html

remove, frame and background (use background from first video)

2. Add video to the first video (photos are already in the slides).

3. Add music

Please do not hesitate to ask any questions.

Thank you