CCL: Fermi resonance & Vib spectroscopy

Hello There,
I am basically from biology student and doing my Masters. I am not well versed with spectroscopy & theory and in the process of learning.
I am doing some vibrational calculations and I have couple of fundamental doubts.
1) I would like to know how to assign the vibrations to the frequency from theoretical data. I mean, how do I give the n1, n2,  n3,  ?. corresponding each frequency? (neu1, neu2, etc,)
2) About Fermi resonances. How do I select the bands/modes which form the Fermi resonance.
Also could you any one of you suggest some online materials to read/ OR From where (books) to get some information related to these? I would really appreciate any feedback from you.
I guess some one in this list has asked questions similar to what I like.

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