HI,
1. You can use SDW, which will take care of creating LUN mapping it to filer etc... (If you already have LUN on filer you can just connect that LUN from SDW).
Or, if you do not want to use SDW,
2. Open start menu -> iSCSI initiator from your windows machine, copy the iqn, create an iGroup for this in Filer and map the LUN to this iGroup. Add the filer to the portal address in iSCSI initiator in windows machine and discover. The LUN should show up.
Thanks,
Arun