Convert FIR compiler and FTT into SOPC ready IPs using SOPC component editor

Hi, I am now using the component editor to create FFT component for SOPC Builder. My system only contains FFT and FIR, and FFT is supposed to be the slave of FIR. Here are some of my doubts:

First, for the signal named "clk", should its interface be "clock_reset" or "clock input " or "clock output" or anything else?

Second, there is a signal called "inverse", seems it doesn't belong to the Avalon ST interface signals, why does it appear in the component editor? How should I define its interface as well as signal type?

Third, if I were not to connect any component to FFT; hence, in order to obtain its output data, Must I set its output signal (source_real, source_img) to be conduit interface type?

Thanks a lot for your kind advice!