Simple..
there are list of website where you can found EASY to understend VoIP FAQs and infos...
1.Low Cost VoIP
2.Free VoIP Services.net - Home

VoIP News:
Daily News on betamax Freecall, Voipcheap, Voipdiscount, Internetcalls, JustVoip, SMSdiscount, Poivy, Voipbuster, Voipstunt, Webcalldirect, Lowratevoip, Nonoh.net, Sipdiscount, 12voip, VoipWise and many others
.....
Just found few and you will be inside VoIP within hours ;-)