@xoazues - For opacity 0% just click the visability of the layer to "off" ( the little eyeball) ie as in so you cant see it

This tut is helpful
An alternative is to try this:
Duplicate firsts frame once witht the text layer marked as invisisble (no eyeball)
on the new frame turn the visabilty of the text layer to "on" (with eyeball) with opacity of 100%
hit the "tween" button (located on the animation menu
Select 5 frames to simulate this tut exactly or more frames for a smoother (but larger file size) animation.
to fade it simply duplicate the last frame
set the text layer back to invisible and hit the tween button again using the same settings you used the first time.
enjoy