Subject: flipping a coin.

I am an 8th grade science teacher w/ a question about rotation:

When you flip a quarter (or other coin w/ noncentroidal center of mass), is there a higher probability that one side will appear or is this a misconception?........When flipped, will the coin spin w/ oscilating angular velocity?......will the coin spin around its centroid of center of mass?......any information or expansion on this idea would be greatly appriciated.

I have been given conflicting accounts in my undergrad coursework in physics classes.

Re: flipping a coin.