Build a simple custom Visual Composer element

Hi, Im trying to create a custom wordpress visual composer element that simply displays a number of woocommerce products with a list of categories and a filter above them. It also should have a load more button at the bottom to ajax load more products. The categories and filter must automatically update the product grid via ajax. I have started doing it myself but I cant get the load more feature to work properly and need someone to explain why it isnt working. Should be easy for an ajax expert. Max budget $15 as most of the work is already done. Thanks, Scott