Hi Quiet singer UK...Having sung professionally in a variety of circumstances for a number of years maybe I can add to what's already been suggested. Street singing was causing me to lose my voice and I was fortunate enough to find a 'classically trained' contralto. 3 lessons and the exercises she showed me I still use today, more than 20 years later. Picked up 2 books on yoga...'The Complete Book of Yoga' by Swami Vishnudevananda and 'Light on Yoga' by B.K.S. Iyengar. They're both available in paperback, I believe. The vocal intructor showed me two to use my 'throat' properly as it relates to singing and the yoga books showed me how to 'breathe' as it relates to life. Within 6 months I was holding notes out for 45 seconds and projecting like an opera singer. Yogic breathing will allow you to project your lower register as easily as you project your upper notes. It takes time and concentration to develope the techniques, but well worth the effort. After a time you wont be able to sing improperly! lol You may want to find a yoga instructor to help you with learning the breathing techniques as I was stubborn and passed out once! Anyway, I hope this reply is helpful and good luck!