The WPBakery Page Builder comes with a bunch of built in shortcodes and is one of the core extensions from the Unyson framework. In order to start visually building a a new page all you have to do is:
Go to Pages > Add New in order to add a new page.
Press the WPBakery Page Builder button to enable the WPBakery Page Builder editor.

The builder is composed of elements that can be added on the page by dragging & dropping them (or by clicking on them). These elements are separated on 4 sections:
Layout Elements - composed mainly of different column elements and a custom full width section used to create the page structure

Content Elements - composed of shortcodes used to create the page content. You'll find all you need here: buttons, images, quotes, icons, sliders, contact forms, testimonials, tabs, etc.

Every shortcode be it a column, section, content or media has different inbuilt options. To bring the options up all you need to do is click on the shortcode:

Another useful feature is called Templates. You can use it to save any templates you want for later: More about saving and loading templates can be found in this article.