Henry,
Honestly, I'd vary my plan depending on the environment; however, here's a loose list of things to do. It's very short on details, but I did dig up a few URL's to useful links. Most of this will be overkill, but better safe than sorry.
1. Confirm OnTap install
-Run sysconfig -a and verify the following information:
1. NetApp Release: X.X.X is compatible with all products you plan to use: http://now.netapp.com/NOW/products/interoperability/
2. BIOS version and Loader version are correct for your release
3. The filer can see all the disks you've purchased and shelf ID's are correct
2. Confirm cabling.
- Run sysconfig -a and verify the following information:
1. System Storage Configuration: Multi-Path HA (Highly recommended)
2. System ACP Connectivity: Full Connectivity (Best practice and "fun" to cable the first time)
3. For added confirmation download and point wireguage at your new filer: http://now.netapp.com/NOW/download/tools/wiregauge/
3. Confirm networking
- Run ifconfig -a and verify IP's are assigned properly, and any vifs/ifgroups are setup properly (wireguage will check your networking failover settings for you if you're new to NetApp active/active clustering)
4. Confirm firmware
- Easy way: download latest disk and shelf firmware revs for your version of OnTap (https://now.netapp.com/eservice/Firmware.jsp) and verify you've got them installed. (See if you have the latest disk qual files in /etc/ and the latest firmware revs in /etc/acpp_fw, /etc/disk_fs, /etc/shelf_fw) If you're not certain what firmware to use for your version of OnTap call support
5. Disk setup
- Implement aggregate, volume, (and lun) design
- Run sysconfig -c and call support if needed
6. Protocol setup & testing
- Setup CIFS, NFS, iSCSI, and/or FCP (FCoE) according to best practice guides
- Run sysconfig -c and call support if needed
- Utilize iometer (http://www.iometer.org/) in conjuction with perfstat (http://now.netapp.com/NOW/download/tools/perfstat/) to simulate anticipated load and identify any design problems
Granted doing all this is time consuming, you can always get a NetApp PSE to do it (or, if that snow capped mountain is the view from your office I'm available for on the side weekend work ^^)