Originally Posted by: ramoncandido
Frankly I haven't applied this Circle of 5th fully to actual use specially to songs. If there are mistakes kindly correct me.

It looks like you understand the basic concept. The next important step is to apply it so that it becomes a useful tool to you in making music!

I cover the circle of fifths & it's possible applications in this tutorial.

http://www.guitartricks.com/tutorial.php?input=835

Hope this helps