SQL & PL/SQL

I'm trying to write a procedure for an exercise I'm working on. I got an error that I needed to use a "Bind Variable," so now I'm trying to pass a bind variable to the procedure. I am supposed to get user input.


CREATE OR REPLACE PROCEDURE insert_glaccount
(
account_num_pram general_ledger_accounts.account_number%TYPE,
account_desc_pram general_ledger_accounts.account_description%TYPE
)
AS

BEGIN

INSERT INTO general_ledger_accounts
VALUES (account_num_pram, account_desc_pram);

/*Error handling to coming soon*/

END;
/



VARIABLE account_num_var general_ledger_accounts.account_number%TYPE;
VARIABLE account_desc_var general_ledger_accounts.account_description%TYPE;

BEGIN
:account_num_var := &account_num;
:account_desc_var := &account_desc;

CALL insert_glaccount(:account_num_var, :account_desc_var);


END;


Now I'm getting an error: "Bind Variable "account_num_var" is NOT DECLARED"

Can someone please explain how I'm messing this up?