How should i forward my domain to my computer

Hi , I have domain register with dreamhost and I can not afford hosting price so i make my computer as host. So what should i do to make xxxx.com to redirect my computer at http://xxx.xxx.xxx.xxx:port/folder
please help me out with this... please provide step by step instruction if u can... thankx

Edit the DNS records and point domain.com and *.domain.com to your computer's IP address.