Frequency spectrum of IFFT output

[wes saunders]

Output of IFFT block is summation of N orthogonal sinusoids. These
sinusoids each have different frequency and the lowest is 0 (DC). In
reality output is array of complex numbers which represent complex
weight for corresponding sinusoidal basis function. I neeed to know
how to present output signal in frequency domain spectrum. I'm
confused with complex numbers. Anybody knows solution to this problem?