fading in is very similar to a fade out, just a little more difficult to comprehend. By your description it sounds like you know how to fade out, but just to recap.
To fade OUT, you create your text, then one by one you fade each word. If the word (or whatever element you are fading out) is not a symbol you will need to convert it to a symbol. Set two key frames, one where you want it to begin to fade out and the other where the fade should end. Select the ending key frame, change the alpha value to 0%. Finally select a frame in between and create a motion tween. The word will fade out. When the playhead reaches the first key frame your word begins to disappear until it reaches 0% alpha at the final keyframe. Pretty obvious.
To fade IN, is simply the reverse process. Create your text, and convert each element that will fade as a unit into a symbol. You will also create two key frames. The first key frame is where it beggins to fade in and the second is where it has fully appeared. But this time select the FIRST of the two key frames, and set it's alpha value to 0%. Select a frame in between and create a motion tween. NOW when the playhead first reaches the word it's alpha value is at 0% and it gradually becomes visible. It will remain so unless you later add a fade out.
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