Domain and subdomain configuration in dedicate windows server 2008

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http://serverfault.com – my domain name is mydomain.com that created 2 child domain for it in domain registrar. ns1.mydomain.com -> ns2.mydomain.com -> in my windows 2008 server with ip address, iis and dns service was installed. i want to add mydomain.com to iis and dns that people access to it over internet and by www. and create user.mydomain.com in iis that host other application with its dns configuration. i do these but dont get response correctly,please help me. (HowTos)