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i have bought a goddady domain name, can anyone help me, how to point that domain name to my vps server (my server IP)
Click on: Adding or Editing A Records
Guide with step-by-step screenshots: http://www.meshbrains.com/wp-content/guides/Adding_a_DNS_A_record_at_GoDaddy.html
If you want that your IP also resolve to your domain name contact your host to set up PTR/rDNS record for your server IP or do it from control panel if that's possible.
You need to set your A records to VPS IP.
You can see here: