Cory is right about back pain, it is often referred pain from elsewhere, as a massage therapist working mostly on football(soccer) players, when they have back pain it is almost always something else.
Deadlifting while a great exercise, should not be done without being coached in correct form (statistically, it is the number 1 exercise in the gym that causes the most injuries) and depending on how you do the deadlift it will focus on different muscles.
one of the most effective hamstring exercise (based on studies looking at muscle activation) is hamstring raises (also known as Nordics) specifically the eccentric portion and targeting glutes is incredibly effective with Hip Thrusters.
Ideally you should get at least a few session with a trainer at the gym to show you how to do a wide selection of exercises
http://www.exrx.net/Lists/Directory.html this site will show you good form for most exercises and was put together by a group with masters degrees in exercise physiology etc. rather than doing what many do and look at youtube videos posted by people with unknown qualifications or experience.