Build a Website

I am looking for customization of wordpress theme, here is the link to the theme I have purchased [login to view URL] We are looking a building a website for our training company which deals with online courses (self learning), virtual live training and classroom training. Theme does have online courses (self learning) option. Also visual composer along with it, where I could create a page for virtual live training and classroom training any number of times. But I am unable to add a functioning register/buy/take course button or option on that page. So what is required is; When I create virtual and classroom courses page for different courses and cities across the world, people who visit the page should be able to buy or make payment for that particular course. You could either create a widget or a short code that could be inserted at a right place on a new page created or even on the events page that excist on the theme. We could talk about te commercials