On(release): Displaying a movieclip -> waiting -> jumping to frame

DISCLAIMER
I’ve just started to learn flash to fulfill a class assigment. This problem probably has a very easy answer, but I can’t find it and now I’m getting close to my deadline.
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PROLOGUE**
The title describes what actions I’m trying to put in a button.
I’m making a quiz. Each keyframe has a pic and 4 buttons. The correct answer should show a green V onscreen; the wrong answer should show a red X. After one second, it jumps to a new question in a new keyframe.
I’ve made the X and V as both 12-frame movieclips and 1-frame graphics on the library, but can’t seem to make them show up correctly.

1st issue: showing the movie clip/graphic.
The movieclip/graphic should appear in the center of the stage after you press the button.

Currently, the clip is there from the start; can’t find a way to make it start invisible, then visible when I click the button.

2nd issue: waiting 1 second before going to next frame.
I’ve tried using setInterval, but failed.
Maybe the best way is to use a command that waits for the movieclip to play before making the jump?

3rd issue: jumping to a random frame inside a preset interval (like frame 100-200)
I think I got this one. Will ask for help, if needed, after I clear the two issues above.

IMPORTANT: I’m using Flash 8.