There's an EXCELLENT set of AE tutorials right here on the COW, done by Andrew Devis -- AE Basics. You'll find a boatload of useful information on AE, including how to deal with 3D. Pay attention to building camera rigs, because they can really help the process. Rigs make AE cameras work more like real-world cameras. Don't worry if Andrew uses a different AE version than you have. They're still great lessons.
But there's no substitute for experience. You just have to do it to see how it's done.
Chris Meyer, an internationally-known figure in the AE community, makes a joke about 3D. The reason for the 3 is because it takes three times longer to do something than it does in 2D.
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