Pre-made Enfold child theme

upload it and activate it on dashboard
in Enfold Child Theme Options it might be necessary to goto Import Data – the button at top “Import Parenttheme Settings”

I think a Child Theme is a good advice because if you have to change something in your Theme Code it will not be lost by updating the Parent Theme.
A lot of changings here on Board Support work via child-theme functions.php (first of all it is an empty functions.php in the child-theme folder)
f.e. activating the custom.css on template builder elements
add_theme_support('avia_template_builder_custom_css');

or to show in lightbox the full-size image and not the large one:

add_filter('avf_avia_builder_masonry_lightbox_img_size', 'avia_change_gallery_thumbnail_link', 10, 1);
function avia_change_gallery_thumbnail_link($size)
{
    return "full";
}

etc pp. the support is full of such changings.