Well, for the black bars, just use the Show Picture and Move Picture commands. Since you want them to move in, all you need to do is have one picture that is a black rectangle as wide as the screen and as tall as you want. Then you'd show two pictures - both with x = 0 and one with y = 480, the other with y = -1*(height of picture). Then you would just use the Move Picture commands - moving the bottom one up (to 480 - height of picture) and the top one down (to 0).
For the fade in, use the Change Screen Color Tone command. To fade it out, just set it to black (-255, -255, -255) and make it take 100 frames (there are 20 frames in a second). To fade it back in, just set it to regular (0, 0, 0) and make it take 100 frames