Aaron Rabinowitz has done some excellent tutorials on text animation in AE, I would recommend starting with those. Otherwise, I did a tutorial on the hidden presets in AE which will show you where to find the hidden built in 3d text animation presets. Along with many more.
In short, click the panel menu in the effects and presets panel and choose browse in bridge and it will take you to them. Then to apply, make sure your layer is selected and double click the preset in bridge you wish to apply.