Apache2Triad Help, Support and Development

[estado3]

I have just come on the site, and I am looking for step by step instructions on how I can set up a site I have already registered on my pc so it can be accessible to anyone on the net, so my pc acts as the server, I understand once I have installed apache2triad it will come with apache, php, mysql, how do I go about allowing everybody on the net to access my site by simply typing the url i.e www.example.com?

I understand I will have to change the DNS server at my registrar to point to my site, I expect this will be my ip address, I am assuming some change has to be made to enable my ip address supplied by my isp to act as a DNS server? so that it will have an address ns1..... ns2......
Once this is done, and my site has files on it, will the process be complete?

Thanks for any help