About activate the license of VC plugin, actually you don’t need to do that. We’ve been include VC plugin on our theme package with Extended License, so you don’t need to activate the license of those plugin.
About creating a page with VC plugin, did you’ve visit our documentation about it here http://support.jegtheme.com/documentation/visual-composer/? Please note, you will need to choose Landing Page Builder – Visual Compose page template when creating a page.
Also, if you want to create a page like our Villa Demo page, you can go to check this page http://meheershah.com/?page_id=943&preview=true on your site.
Let us know if you have further question.