Make a stored procedure that sends an automated email using sql express

I have created a stored procedure below

CREATE PROCEDURE CustomerLimit
AS
BEGIN
    SELECT customername,creditlimit,outsanding FROM customer where creditlimit < outstanding
END

I am trying to have this information sent as an email whenever the conditions of the select script are true this is what I have created to be able to send the email to a specific user in the database but am unsuccessful since am using sql express

USE msdb;
GO

EXEC sp_send_dbmail