Build an Online Store

Hi there, I'm building an e-commerce website with Wordpress (Flatsome theme) and would like help with the following: - Fix pictures to thumbnail (I have added all products but the pictures don't fit properly in the thumbnail) - Add a footer like the attached (I know it can be easily done with text widgets and ninja form widges (I have the plugin installed) but having trouble doing it myself - Create a banner - slider for the homepage - Add a categories sidebar in my product's page.