Brent Ozar wrote a SQL script called "Blitz! 60 Minute Takeovers" that is meant for DBA's taking over existing database servers and databases that they are inheriting. It's a priceless gem and I have used it so many times in the past when taking over new database servers and databases that I am not familiar with. It should be a mainstay in your SQL toolbox. Check it out at http://www.BrentOzar.com/go/blitz 😀
"Technology is a weird thing. It brings you great gifts with one hand, and it stabs you in the back with the other. ...:-D"