i am assuming that you have worked a little in ProgDVB, now get these two plugins named PIDScanner & DataGrabber from ProgDVB's website http://www.progdvb.com and then put them under the plugin folder of your ProgDVB e.g. C:\ProgDVB\Plugin
Now while running ProgDVB, point to a channel has a Green Diskette icon (normal video channels are marked with V and Radio are marked with R icons), Now from the Plugin values click on the PIDScanner and scan it. It will give you some values note down these values and now from the Plugin menu select DataGrabber, feed the values into it what you just noted down and let it take its own time (may be hours some time), here you go after some time you will start receivng data, sort it by yourself for the usefull one.
If you want to search for data channels, goto lyngsat.com and goto your satellite which you have installed, in the channels list all the channels marked with Interactive TV/internet are suitable for data grabbing, these channels are marked with light purple color.
Hope this guide will help you, wish you good luck.