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Open Proteus software & implement the circuit as per above diagram.
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Give a constant voltage Sinewave as the Input Signal.
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The Output Voltage of IFT circuit will be max. at 455KHz (Resonance Frequency).
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Vary the Input Voltage's frequency to and fro from 455KHz & note down the Output Voltage from Digital Oscilloscope.
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Tabulate the above readings, (you can use MS Excel / Google Spreadsheet) etc... as you wish.
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To plot the above values, (here I used MATLAB, you can also plot on graph paper too).
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The log of frequencies were found.
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The Gain in dB is found out by the formula:
Gain = 20 * log ( Vo / Vin )
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Finally the graph Log( f ) vs Gain in dB is plotted.