You'll need Quickpwn and the proper 3G IPSW file. A google search for something like "iPhone 3G 2.2.1 IPSW" should yield some results. As Slick said, you will be stuck on the Edge network, and even then you have to sign up for "T-Zones" data plan or something along those lines. Check the forums at http://www.modmyi.com/ for more information.
Edit: I have only Jailbroken 2g iPhones, you will have to go through more steps to get the 3g updated and jailbroken, using Pwnagetool and yell0wsn0w. Read Here for more information.
I had no clue how to jailbreak/unlock an iphone and it took about 10 minutes using google to find out how to do it and another 10 minutes or so to actually do it.
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