WP Query Taxonomy Posts

Hello,

I am working on my first theme from scratch and I encountered an issue while retrieving some posts linked to a taxonomy. Basically, I have some posts that are linked to a category news (seven posts). Then two of them are linked also to a custom taxonomy called ‘sliderType’ which has a category called Big Slider Home. When I try to retrieve all the posts linked to that taxonomy I somehow get all the posts from the database.

This is the code of the taxonomy..
add_action( 'init', 'create_cat_slider' );

function create_cat_slider() {
register_taxonomy(
'sliderType','post',
array(
'label' => __( 'Slider' ),
'hierarchical' => true,
)
);
}

.. and these are some versions of the loop

$args = array(
‘taxonomy’ => ‘sliderType’
);
$custom_query = new WP_Query( $args );
echo $custom_query->post_count;
if($custom_query->have_posts())
//rest of the loop

OR

$custom_query = new WP_Query( array( ‘post_type=post&cat=10’ ) );
echo $custom_query->post_count;
if($custom_query->have_posts()) :
//rest of the loop

I even tried some variations with tax_query in the array ( and I know it has to be an array in an array).

I have no idea what am I missing and I would be grateful if anyone could help me deal with this issue.

Cheers