Virtualhost setup problem

In using the following code at the end of my httpd.conf file

NameVirtualHost *:80
<VirtualHost *:80>
ServerAdmin home@abc123.co.uk
DocumentRoot "/www/abc123"
ServerName www.aabc123.co.uk
ServerAlias abc123.co.uk
ErrorLog /www/abc123/error_log
CustomLog /www/abc123/access_log common
</VirtualHost>

What do I need to do with the following code that is at the top of the
httpd.conf file ????

Listen 80
ServerRoot "/www/Apache2"
DocumentRoot "/www/abc123"

ServerName localhost:80
ServerAdmin admin@localhost

ServerSignature On
ServerTokens Full

DefaultType text/plain
AddDefaultCharset ISO-8859-1

UseCanonicalName Off

HostnameLookups Off

ErrorLog logs/error.log
LogLevel warn

Apols for 2nd message, as server did not respond that it had sent 1st
message.