Frequency analysis

Hi all 
I have a motor fixed on a support defined by a bent sheet metal, and I will check the thickness of this sheet and so that there is no resonance during the operation of the motor by the application of modal analysis.
My question is what data do I need to enter it or just do I make the "fixed geometry" of this sheet?
And I wanted to know how many frequencies I can use it

(I'm a beginner in vibrational simulation)

Kind regards