How far out from the house should I go with decorative rock?

I want to add decorative rock around my house. I would like to go as narrow as I can around most of the house but in one place I want to extend out for a rock patio. I am not sure of what I need to put down first, what is the best material to keep the rock in place, and how far out from the house would look best. (I know, I have more than one question!!) I would appreciate any help you can provide. Thank you---