The questions should be
Do you want to protect your home/ or business
is this a small , medium or large installation in your opinion
What is the Risk? Low, Medium, or High or Insurance required
How many doors would you need to contact , at minimum you should do the Entry Doors
Home many Area's would you like to protect with Interior security
( such as Motion Detectors)
Stage the questions based on the Sensitivity or Risk and also the basic size of installation......
Doors, Motions, Glassbreaks, Windows, Pet sensitive, Attack from other openings, Fire Detection, Area's to Control from etc, etc, etc......
The list would be long for a Higher Risk installation
and Light simple for a basic system.....
Then, once discovered the zones, devices, entries, list compatible systems that a person can do, obviously the question to ask is if they feel they can do this installation?
If its no, then it maybe worthwhile to let a nearby company/person help them out or just consult or finalize the installation.