Hi Deeksha,
You need Mac to create your mobile application. Then you need Windows box with either iOS emulator or physical device connected. TestComplete must be running on the Windows box (as it is Windows application and can run on Windows platform only) while your mobile application must be running on either emulator or physical device.
I would recommend you to go through this help section:
http://support.smartbear.com/viewarticle/63722/BTW, the more relevant forum is this:
http://smartbear.com/forums/f80/Mobile-Applications-Testing