I recently textured the ceilings of my 40 year old house. As I discovered there are several different textures for ceilings.
I found that the best information was available at our local Building Supply Stores. We have two that were very helpful (Lowe's and Home Depot). None of the textures are that difficult once you know the correct steps.
NOTE: IF YOU WANT THE POPCORN TEXTURE USE THE BLOWER. MY EXPERIENCE WITH THE ROLL ON VERSION WAS NOT SATISFACTORY.