First Time installing Asterisk - HELP

Hi, is the First I am installing an Asterisk and I would like to ask for Help, What I need is to configure an Asterisk PBX in a PC with an internet conexion only. I wont use Digium or that kind of staff. I just need it to make calls through internet, to use VOIP. Can somebody help me or tell me where to find docs so as to configure this and make it work?

Thanks a lot

try these sites

voip-info.org/wiki-Asterisk

asteriskguru.com/tutorials/

asteriskdocs.org/modules/news/

Thanks a lot