Gallery Style Display Page

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Trying to workout how to design a navigation style page. Best example i have found would be like the video elements theme from this site http://wpbest.com/themes/press75/video-flick-20/ (click live demo test drive button then --> scroll down to video elements and click). My aim is to have similar system where it will post the first 12 images with what ever related data and then say there is 37 images there will be a nav at the bottom with links to page 1,2,3,4.

 

i am fine with the printing out of the images and what not but i am confused with how to have it so if i click on the page 2, how to get it to reload the same page but with the next 12 results. I am hoping i don't have to have a different page. Minds half asleep it is probably not as hard as i am thinking it is lol

 

any help or tips would be great! Thanks heaps in advance!