Start with the documentation on the DS4300. Here is the url; http://www-03.ibm.com/servers/storage/support/disk/ds4300/installing.html
Make sure you get the documentation on Storage Manager also.
Here is a best practices redbook on the DS4300 (FastT600) that can give you some ideas: http://www.redbooks.ibm.com/redbooks/pdfs/sg246363.pdf
If a business partner is doing the install, they may have a standard acceptance document or they have specified what they will do in a statement of work. Those are good places to look.