set up Vhost

[DinoBiH007]

Hi everyone i am pretty much new here , and i really don't understand how to make my website to public
somthing like www.myname.com or what ever
i was reading all posts and even websites , and i am still confuseed can sombody explain pleasee

and which website is the best to buy the domain ,
can i use no-ip-com >?
please help

[DinoBiH007]

#
# Virtual Hosts
#
# If you want to maintain multiple domains/hostnames on your
# machine you can setup VirtualHost containers for them. Most configurations
# use only name-based virtual hosts so the server doesn't need to worry about
# IP addresses. This is indicated by the asterisks in the directives below.
#
# Please see the documentation at
# <URL:http://httpd.apache.org/docs/2.2/vhosts/>
# for further details before you try to setup virtual hosts.
#
# You may use the command line option '-S' to verify your virtual host
# configuration.

#
# Use name-based virtual hosting.
#
##<<what should i put here:80

#
# VirtualHost example:
# Almost any Apache directive may go into a VirtualHost container.
# The first VirtualHost section is used for all requests that do not
# match a ServerName or ServerAlias in any <VirtualHost> block.
#
##<What should I put here *:80>
## ServerAdmin admin@mysite.com < correct
## DocumentRoot /www/docs/dummy-host.example.com<< where should i change this configuration
## ServerName mysite.com
## ServerAlias www.mysite.com
## ErrorLog @rel_logfiledir@/dummy-host.example.com-error_log<<< I DON'T UNDERSTAND THIS
## CustomLog @rel_logfiledir@/dummy-host.example.com-access_log common << THIS TOO
##</VirtualHost>

##<What should I put here *:80>
## ServerAdmin webmaster@dummy-host2.example.com
## DocumentRoot /www/docs/dummy-host2.example.com
## ServerName dummy-host2.example.com
## ErrorLog @rel_logfiledir@/dummy-host2.example.com-error_log
## CustomLog @rel_logfiledir@/dummy-host2.example.com-access_log common
##</VirtualHost>


i want to have 1 site , avaliable to everyone
so please helpp