Configure a fully working web hosting server with dinamic ip address

Ok what i need is a fully working webhosting server using: A linux computer (ubuntu server in my network), this server already have apache, mysql proftpd and and dydns udater running ok This computer connect to internet usind DINAMIC IP ADDRESS!!! So what i need to configure: 1 - DNS server 1.1 - My machine need to be visible in internet so the registrar companys can see the configurations, (i heard that can be done creating no-ip acounts and pointing to my host) so the ns1 and ns2 should be like [login to view URL] and [login to view URL], both in my computer ant my router (already configured also) redirect the traffic to the specified internal address (linux server). 2 - Emails and Sendmail working cant configure properly the sendmail function not sure what to do here 3 - A control panel (webmin is fine just have to teach how to use it to add new domains) I must have to add myself new domains so i can host more sites in here Just to remember All must be working on a Dynamic ip address and inside mynetwork using a ddns service (no-ip or dydns)!!