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A Level Physics question on frequency/damping

I have this physics question to do and I get parts of it and I obv get the free body diagram but how do I work out part B of the question?

A 10kg block is in a simple spring mass dashpot system. It is released from rest at distance x0 to the right of the equilibrium position. The stiffness, k, equals 50N/m.
The damping coeeficient is 15N-s/m.
A - Draw a free body diagram (which I've done)
B - Calculate the natural frequency, damping ratio and damping velocity
C - Calculate the displacement x as a function of time. t=0 is the time of release.