Need help using Tor browser?

[J]

I'm trying to set up Tor on my computer. I've never done this before. I downloaded the Tor browser bundle, and I started Vidalia, but I can't seem to get a browser window. The Vidalia control panel says that Tor is running, but I'm not sure how to use it to access the web. I'm using Windows 7, and my regular web browser is Mozilla Firefox, if it matters. If it says Tor is running, does that mean if I use Firefox that I'm fully anonymous? All the instructions I found online say that when Tor starts, it will automatically open a browser, but that doesn't happen. I can't find any browser in the Tor browser bundle. I'm new to this, so I'm not sure how to proceed. Please only answer if you actually know what you're talking about.