How to add my own images to the views slide show?
First you need create a content type for your slider (admin/structure/types/add), let alias it slider, then add your desire fields to it ( maybe a image field and title as a slider slogan ), then create a image style for your slider in admin/config/media/image-styles/add ( create a image style according to your slider image in your design), then   in views  change filter to show only images form slider content type.

For more details do  "How to Build Drupal 8 Slideshows" step by step.