This is especially useful to new players. If you haven't subscribed to Ken on YouTube, may be a good idea. He's an active UU'er and this is a great tutorial on beginning and ending a song:
https://www.youtube.com/watch?v=MQ9za3hzRBA&feature=em-uploademail
https://www.youtube.com/watch?v=MQ9za3hzRBA&feature=em-uploademail