Well depends. I use to give my mom massages, no not in the sick way, just around her neck and collarbone area. Anyways with my GF I apply the same thing, but then continue on the back and butt.

Avoid bone areas, obviously... I tend to use my thumbs below the blades, I have 4 fingers on the side of her body then rely on the pressure from my thumbs to move the muscles on her around and such. For shoulder blades I use thumbs also, but I use my other 4 fingers for moving/massaging above the area of the thumb.

Hard to describe. Try to be soft, unless she has an area that is sore, then you can be a bit stronger to make the muscle feel better. Remember find muscle areas, I got no clue how to massage front of the body. Its about pressure on the muscles and moving it around, not just fondling.

Thats my advice hope that helps a bit.