Ibuki theme advice

Not sure if this is the right place to get answers to my ??.

I’ve purchased/installed the Ibuki theme along with the bundled plugins:

Redux Framework
Slider Revolution
WP Bakery Page Builder
Visual Composer
AZ Custom Post Type
AZ Shortcodes
Contact Form 7 (not activated)
Oath Twitter Feed (not activated)
Woocommerce (not activated)

I’m thoroughly confused as to what does what. I thought I would be creating my pages in Ibuki but it seems I have to use Visual Composer.

Can some please tell me the relationship between these components? What does what in relation to the Ibuki theme?

I’m having trouble even figuring out where to create a header on my static landing page.