SQL & PL/SQL

I was wondering if someone could help me out with a simple function I'm trying to create. I'm kind of new to functions in oracle and I don't know the exact syntax or what it expects from me. I would appreciate it if someone could look at this and point out what I'm doing wrong.

CREATE OR REPLACE FUNCTION freshman_status_term(
pidm IN varchar2

)

RETURN varchar2 IS term

BEGIN

SELECT sgbstdn_term_code_eff INTO term
FROM sgbstdn
WHERE sgbstdn_pidm = pidm
AND sgbstdn_styp_code = 'F'
AND sgbstdn_stst_code = 'AS'

RETURN term;

END freshman_status_term;

The goal of the function is to find out the term for when a student is listed as a freshman. I keep getting errors though, so something must be wrong with it. Any help is appreciated. Thanks.