Custom post type with custom fields enabled, is there a way to set a default group of fileds?

Meta Boxes are what you need. 

function add_custom_meta_box() {
    add_meta_box( $id, $title, $callback, $post_type, $context, $priority, $callback_args );
}
add_action( 'add_meta_boxes', 'add_custom_meta_box' );

Set the custom post type in the 4th parameter. This should get you started:

Custom Meta Box in WordPress Post Pages and Custom Post Type

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