Hello friend <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
Angles are quite simple once you get to understand it.
But basically if the angle is 0 it means it's going to the left. If it's 90º then it's downwards, 180º is right and 270º is upwards. So keep that in mind whenever you are drawing your sprites.
So if the sprite is following the mouse, it will turn 360º pointing to whatever direction the mouse is. I don't think that is quite a good idea to use this on the character of a platform game.
The most common thing to do is keep the character standing normally and use some type of target to follow the mouse around the screen.
But since I have no idea of what you're trying to do there, I can't explain much. But well...
I created a .capx about angles to help a guy on another post. You can take a look at it here:
https://dl.dropboxusercontent.com/u/183 ... otate.capx