360933 Customize Existing Joomla Temp

Hi, I have a website and bought a Joomla Template. I need to cutomize it with my pictures and make it work for me. The Template is an ecommerce templata and I want to sell some products. I don't know how to use Joomla and I need to quickly upload the pictures and start selling. I have the pictures ready jpg. I have several categories of products which I want to sell. I'll need a freelancer to grab my pictures and organize the website in order for me to start selling. The user will select the categories and sub categories and finally pick the item. The item picked will update the cart. This is the actual website and I want to keep it. So I just need you to place my pictures, erase the stuff that comes with the template and just give me a ready to sell web site. I think this is just made through the admin panel, but not sure.