I can tell you following:
1. if you're connecting to AS400 from the desktop using an iSeries client, you'll need that client on the SQL server.
2. Connect to AS400 using LINKED SERVER with the correct AS400 credentials
3. Make sure the the user has C/INSERT/WRITE permissions
4. Use OPENQUERY to CRUD
select ordno, orqty, fitem, fdesc
from openquery (AS400, 'select ordno, orqty, fitem, fdesc
where ordno LIKE 'M3384%'