Ok, I hope I can help out. This might be long so you might want to cut and paste or whatever.
First!
1.Type your text and convert it into a graphic.
(Click on the text then click insert>convert to symbol>click on "graphic" and name it)
2.Create a movie clip for the "fade in text"
(click on insert>convert to symbol>click on "movie clip" and name it)
3. Drag the text to the center of the screen THEN at whatever frame of your choice(frame #10 for example)insert a "keyframe" THEN click on "keyframe#1" and go to insert>create motion tween. If the first keyframe isn't selected then do so, then click modify>instance>click on color effect tab>select alpha and put it to zero.
Wait one thing..at keyframe 10, add a stop action by double clicking on keyframe10 > select the actions tab > click the plus sign and select STOP. This will stop the movie from repeating it self.
Hope I was of some help.
Peace