I am sure it seems like you are getting the third degree here, however, as has been already said you are asking very basic questions.
It seems like your a little naive running an alarm company with very little knowledge or experience, and poorly run companies with engineers that have little or none experience give the industry a bad name. I am sure that you are doing your best, and the reason you are here is that you are trying to learn, but you seem to be out of you depth which again is worrying. If you asked any one of the alarm company owners here how they started their business and learned their trade none of it would be thanks to the forums, most id guess over 99.9% would have started off working for another alarm company.