There are two types of DML triggers: statement level and row level. The statement level trigger fires once per transaction, while the row level trigger fires for each record effected, per transactions. In order to use :new or :old, the trigger must be a row level trigger. The trigger you have created is a statement trigger. To change your trigger to a row level trigger, you must add the following line:
FOR EACH ROW
Your trigger will then look like:
CREATE OR REPLACE TRIGGER my_test_trigger
BEFORE INSERT ON my_table
FOR EACH ROW
DECLARE
v_out number ;
BEGIN
my_procedure(:new.column1, :new.column2, v_out) ;
:new.column3 := v_out ;
END;
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