Photo ranking/contest

Hi,
Can you please explain in steps how I create a photo contest.
I use JomSocial 4x and Joomla 3x.
There should be a menu link which guides to a section where users can upload photos to one single contest only and then go through the contest gallery and vote for their favourite.
After a time period the contest is closed and we can see the winning picture.
So: there's no additional categories or functions needed - only the photo contest.

Would be great if you could help out here soon!
Thanks in advance!