I know most you know the DNS but i want to do my own dns or what every they call.. i want to sell domain names online.. like smallbussines.yahoo.com or http://www.123-reg.co.uk ... how can i do that can some one help me please...

Thank you...

I would start by learning how DNS works. There are a lot of providers on the internet, I use DynDNS and they have done a spectacular job for my website and mail server. Selling domain names is easy, in fact all that you have to do in find a buyer and register the domain for them. If you wish to host their website as well, it gets considerably more comlicated as you will need a server and a huge internet connection, backups, supplementary power, staffing for 24/7 support, and a host of other things. Howting your own DNS server doesnt really make that much sense when there are so many reputable suppliers out there that are very inexpensive.

You need to learn DNS thoroughly and have experience fixing in before you sell it to others as there is no tolerance for a business website being down because its DNS server is lost...