When you will decompile the model file you will find this notepad file! It gives the model an AI(thoughts),damage,streange,origin(the middle of the model),hit boxes...ect. If you are new to mapping then I seggest you to start with easier things to know hammer,read the tutorials,to look at example maps and in finished maps,to map a few maps and get good at mapping and only then move on to modeling,spirit and even coding!