Most budget guitar tuners are suitable for beginners and are very easy to use. Choose a tuner with LEDs to indicate sharp and flat - most LEDs have this as standard. Manual note selection can be useful for beginners and a particular feature that is useful for beginners is an off-note indication. This will tell you which way to tune even if the string is a very long way out of tune.
Strobe tuning is more difficult to use and probably not suitable for absolute beginners.
Struggling with left hand chord shapes?
Check out this great little gadget from http://guitar-gizmo.com
A great learning and practice aid for beginners, for less than the price of a set of strings!