Were could i find a tutorial on hosting your own domain/dns.
Also things along the line of managing apache/mysql would be nice.

i realised this on windows system but the method must be the same on unix
You must buy a domain name from an organism ( ovh for exemple )
After the registeration accepted you must do monitored you dns settings ( from organism ) to point your dns on your static IP
ex : www.toto.com ---> 148.114.145.111

look on the web the differents organism who permits to buy a domain name
Generaly after you have access a forum to help to manage you domain name ( configure mx redirection, cname, .... )

good luck


P.S : you talk about a public domain or a private domain ??

www.freeparking.co.uk is good, they have a web panel where you can config nearly every aspect of your domain/dns