to animate, you have to make a char, delete character 1 then duplicate "Dummy//Dummy" and drag "Dummy2" out of the folder. to make an animation just click 
then click "add kf" then go to the kf's end part then click on it and you can change the costume, x, y, stretch, and whatever is on the bar. btw i mean this bar:
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how to change the credits is simple, go to Front//Credits and just add things. how to fix the "bug" in the icons: go to the character and code then change 
then change 
so yeah thats how you do it if you ask more questions i will answer them for you