Are you trying to do this with existing solutions? If yes, then: galleryproject.org - This is a open gallery that does much of what you want. It is a gallery f

Are you trying to do this with existing solutions? If yes, then: galleryproject.org - This is a open gallery that does much of what you want. It is a gallery first and a store second. joomla.com - If you need a bit more than what workpress can do joomla is very flexable and you can setup the security the way you want. There are a number of stores that you can integrate into joomla. Best of luck!