Podolak I always prefer to separate my name sapce for example a companies internal domain name my be alphacompany.com. There public dns name will be
www.alphac.com.
Also do you palin on running your own dns server. I noticed Buddha Bart stated "Go wherever you registered your domain and login. Then try to set the domains nameservers as your IP. Sometime's their picky and will only accept hostnames, not IPs"
Its not that simple first off you must create a dns server then you must contact the company that you registered your domain nmae with and ask them to register your dns server. If I remember correct you must have a primary and secondary dns server, but you can get around this by signing up for a service like
www.zonedit.com. Now you can use your server as primary and one of theres as a backup. Then you must decide on how your dns server will be publically displayed will you put it in a dmz zone or will you simply forward ports to your box on your lan. Also in order to run a website you will have to set the correct a records and if you plain on using your excahnge server to recieve internet mail you will have to set a a record for the box and a mx record. BTW do you have a static ip and are you behind a router. Let me know and I will go further into how to set exchange up.