That your theme is Woocommerce-enabled simply means that you need to install Woocommerce like you would any other plugin. After that, the plugin gives you a message that tells you that the next step is to let Woocommerce add the required pages, e.g., Shop, Account, etc. It's Woocommerce that thinks about adding the required pages.
Your theme has everything in place for Woocommerce support and to make it look good and in line with the theme's look and feel.
What you need to do is to adjust your shop's settings, add categories, subcategories and products, and add the pages Woocommerce has created to your menu, so that they will be accessible.
Everything that's done via the plugin remains on your site irrespective of the theme you use. However, if your theme doesn't explicitly support Woocommerce (not all of them do), you need to add the support yourself. To do so, here's the relevant documentation link:
However, if you go all the way to buying a theme, make sure it's already Woocommerce-enabled, and you'll make life much easier for yourself.
I hope this has been helpful.