For both things, you'll want to use keyframes.
1) In this case you'll want to have the Opacity of the clip set to 0 with a keyframe in the beginning, then have another keyframe with 100 when the title should be fully shown, a third keyframe of 100 right before when the title should start fading out and a fourth keyframe of 0 when the fade out should stop. You can set keyframes by clicking on the rhombus symbol besides the name of the property and just change the property over there. If the rhombus doesn't show, then you'll have to enable keyframes, which you can do by clicking on the stopwatch (the clock-like symbol besides the property's name).
2) Pretty much like case one, only that you'll have to keyframe the dB instead of the opacity.
Hopefully I was able to explain it well.