Built Online Store like Ebay. Using Marketify Theme

Hi I have gone through your profile. And i am intrested in hiring you. I have a theme which is already in zip folder on my server. install wordpress and customize the theme. Marketify is a theme where can only sell digitle products. But i want that user can sell any product. This is the main and important customization. Other customization, in terms of colours, and a few layouts, functions are fine which are already there in the theme. Just make it work. and also security is key, I don't want people to know its a wordpress theme, as they can want to try to hack into it and i think that's it any other customization may come late Thanks