I believe you can achieve that as follows:

1. Enable the "assign agent automatically at registration" setting:

2. If you want the agent to be the admin (Rather than a random agent), add this PHP code snippet to your site:

add_filter('salesking_assign_automatically_agent_id', function($agent_id){
    return 1;
}, 10, 1);

A PHP snippet can be added to functions.php, or by following our guide here: https://woocommerce-b2b-plugin.com/docs/how-to-add-a-snippet-php-or-js/

and how can i move someone that has an account made on my site to be under an agent so i can place an order for them

To do that, you can go to the user's profile page on the backend. Then, scroll down to this area and select an agent:

Kind regards,

Stefan