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I created a Time series signal of 1024 values based on combination of sine waves

Y=Sin(2pi*50*t) +Sin(2pi*300*t) with t incremented in milliseconds (i.e) f=1000Hz.

I used R Discrete Wavelet package to get the Wavelet Coefficient using Daubechies transform with number of levels=4 . The output were the coefficients W1,W2,W3,W4 and an approximation V4

How to determine the frequency of input signal (50 and 300) from these coefficients ?

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I'm afraid you are using the wrong tool for this. You should use discrete Fourier transform, that will identify the frequencies. FOr instance, see the discussion here.

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