Hello guys and gals,
I am planning on building a robotics limb that goes around a person's hand thus helping them pick up stuff and etc. But the problem is I do not know the Arduino platform to do this stuff. Here are the inputs I am going to use:
Flex sensors
EMG sensors
Out puts to servos that replicate movemnts in the arm, Please help me.
I do not have a board or the things mentioned above yet. 
The way to get good assistance from this forum is to ask specific questions. A two-line statement of a vague project idea and a general request for "help" won't get you anything in particular.
What help is it that you need?
What have you built / tried so far? What worked? What didn't? What parts don't you understand? Start with the basic building blocks and work up to the complete system as you learn about each part.
Jon
Here's a video where they used a potentiometer to turn a servo, just replace it with the flex sensor.
Make sure you get a small servo because the standard size ones might be too heavy to replace a finger. The standard one would be like a wrist. Make sure you don't use the continuous rotation servos because you can't be as precise.
Look into the servo library for controlling servos.
http://www.arduino.cc/playground/ComponentLib/Servo
This guy didn't use flex sensors for a similar project, he used potentiometers, but I think flex sensors would work
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1285891851
Sounds like a great project.