Free Domain Name Registrar

Hello,

I intend to host a malicious website in my own computer. Problem : I don't have the bucks to pay for a domain name. Now questions :

• Where to get free domain names ?
• Is using those risky when we want to submit a malicious website ?
• If I want to send to the victim a link to a Flash exploit generated with Metasploit, can I change the ip adress to a domain name ?