buy the new server, install LAMP on it.. Linux Apache Mysql Php, or instead of apache you could use lighttpd or nginx. after that change the dns on the domain you have and people will continue to access it on the new server
Install phpMyadmin for a better interface to work with your mysql databases
Use iptables to block some ips, activate your firewall to prevent ddos attacks and that is it.
Of course you need to install modules for php, maybe your script requires them, such as memcache, apc, mcrypt, perl, and so on...
and always make sure your server it is up-to-date.
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