If your photos are gone, you can look to see if they are in the trash can. The trash can is only available if you have a Samsung account registered on the phone. If you have it, you can go to the Gallery app > 3 Dots at the top right > Trash can. See if your photos are here and if so restore them. If they are not here, then they are unfortunately gone.
Regarding you having difficulty finding your way around the phone, we would like more information to understand what has happened. We recommend that you get in touch with our customer support and we will be able to help you more easily: http://spr.ly/6186DctJp