How to send and recieve data between two Bluetooth devices

How to send and recieve data between two Bluetooth devices

I'm new to Bluetooth programming. So, I need to make a application to send
and read data between two Bluetooth devices(Windows PC and android phone).
I plan to use spp. I have already read 32.NET documentation in Bluetooth
inthehand library. If somebody can support me to teach the basic steps
should be used in my code in order to connect PC to Android and transfer
data between them.
Is it enough two device have been already paired by Windows? Do I also
need to pair two devices through Windows?
Please help me........!