You don't have to Jailbreak to get apps.

Just launch the AppStore from your iPhone and download away.

There are certain apps that you can't get from the AppStore, like Winterboard (for skins and themes) and other apps that alter the phone's system.

You can learn how to Jailbreak, it's very easy actually, just click here for a step by step guide, you can find a lot of useful information on that website also.

Guys, stop harassing the dude, we were all noobs at some point.