Security :: Audit Update / Modify And Insert

I am using 'Novell Sentinel Log Manager' to collect/fetch logs from my Oracle 11g R2.To enable auditing, first I did following:

login as sys, then
SQL> create user testuser identified by "testuser";
SQL> grant connect to testuser
SQL> grant dba to sharf
SQL> grant CREATE SESSION to testuser;
SQL> grant select on v_$session to testuser;
SQL> grant select on v_$version to testuser;
SQL> grant select on SYS.DBA_AUDIT_TRAIL to testuser;
SQL> grant select_catalog_role to testuser;
SQL> grant select any dictionary to testuser;

Now logon/logof of user 'testuser' are logged , as well as if testuser drops a table or creates a table, its also logged . but when 'testuser' insert a new record, this information does not logged ;( while I need to know exactly what was added SQL> insert into emp (empid, name, salary) values (10002, 'Ron', 6000)

likewise if 'testuser' modify/update an existing record it also does not logged.
SQL> update emp set salary=700 where empid=10001;

which sql statements I have to execute to start auditing 'insert' and 'update', so that I know what was added/inserted and exactly what was updated/ changed/modify by user 'testuser'.