How I can resolve this Procedure in Oracle PLSQL (It's not homework or something like that)

Question

I'm learning Oracle Database and PL/SQL. I'm trying to create a PROCEDURE to query annual salary for an specific employee. What is wrong with my code? Thanks.

CREATE OR REPLACE PROCEDURE annual_salary (
  p_lname IN employees23.last_name%TYPE,
  p_empid IN employees23.employee_id%TYPE)
IS 
BEGIN
  DECLARE
    v_annualsal employees23.salary%TYPE;
  BEGIN
    SELECT salary*12
    INTO v_annualsal
    FROM employees23
    WHERE last_name = p_lname;
    DBMS_OUTPUT.PUT_LINE(v_annualsal);
  EXCEPTION
    WHEN NO_DATA_FOUND THEN
      DBMS_OUTPUT.PUT_LINE('No existe empleado');
  END;
END annual_salary;
/
BEGIN
  annual_salary('Russell');
END;

Answer 1

create table employees23 as 
    select 10 emp_id, cast('Russell' as varchar2(30)) last_name, 6000.00 salary
    from dual; 

create or replace procedure annual_salary (lname employees23.last_name%type) is
    annualsal employees23.salary%type;
begin
    select salary*12 into annualsal
    from employees23
    where last_name = lname
    ;
    dbms_output.put_line (lname || ' has ' || annualsal || ' p.a.');
exception when no_data_found then
    raise_application_error (-20000, 'emploee ' || lname || ' does not exists');
end annual_salary;
/

exec  annual_salary('Russell');