Remember, it doesn't matter if you are singing along with grand-babies or performing in a rock concert, all of these suggestions will make a difference.
6. Sing Up and Down the Scales - I personally NEVER enjoyed singing through the scales. Doh, re, mi, fah, soh, lah, ti, doh all in different keys. There are many great warm-up exercises that we choir directors can use to help focus the sound and the vocal instrument.
7. Eat and Drink Well - There are exceptions to every rule. However, for the most part you need to eat and drink like an athlete. Singing does take a lot of energy so eating a properly balanced diet is a forgone conclusion. Milk (anything made with milk too) , sometimes caffeine, can cause you to develop mucus - YUCKY - and that coats the vocal folds and makes it hard to sing clearly.
Smoking and alcohol are just out. Period. Find out what YOU can tolerate and still make a good and comfortable sound.
8. Listen to Your Kind of Music - Listen and sing along with the music YOU like best. Whatever the style, enjoy. Sure, go ahead, do a wee jig. Just have fun!!