My Mac is relatively new and I am wondering if there is anti virus & fire wall installed from apple?
1. Mac OS X includes its own defences. Unless you're running Windows on the computer, you only need to keep it up to date and use common sense.
2. Open the Security & Privacy pane of System Preferences to configure the bundled firewall.
Regarding anti-virus software, see my Mac Malware Guide. You'll find that, for most people, the built-in defenses are more than adequate.
As for a firewall, note that the average user does not need to have a firewall enabled on their computer. See The myth of the dirty Mac.
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