Voice lessons are extremely important. Clumsy-- just being in a choir is not enough, I'd say, because you don't get invidivual attention regarding specific things you need to work on, vocal health, and warm-ups and exercises specifically for what you need, not what you and 50 other kids need. Choir is great but if you want to be a more knowledgable, healthy, and techniqued singer, definetly take voice lessons with a good teacher.
http://www.freeiPods.com/?r=13865158 please =D