Here is a picture link. THats what I used when I started out, as recomended by other members here when I didnt know squat.
http://ecx.images-amazon.com/images/...500_AA280_.jpg
If your humidity is above 50% you dont need to spray anything. But if you have the lamp on. It will dry out the enclosure. Another reason not to use the lamp.
If you need something to mesure humidity, I think most people in this boards use an accurite thermometer. You can buy those in home depot or walmart too.
http://www.natlallergy.com/images/22...dity-gauge.jpg