How exciting for you!
I do remember being quite confused when I started with X.
Go here and get the child theme.
Install both - I am pretending you don't know... child themes do not work without the parent theme present.
Then activate the license within WordPress.
Then you will be able to check out, download and activate all of the important plugins in the x section on the lhs menu bar in the dashboard area of wp.
Use these forums, use the support forums, maybe... join the FB group (but it get a bit silly sometimes).