Hi, if you need a consultancy firm to make the design for you which is defiantly better then trying to do it yourself because you need an experienced firm that knows about CCTV, also knows about the required regulations that is in your country and has the capability to do the proper threat analysis, to know to install what and where.
You can email those people they are good… info at miskconsultancy dot com there based in the UAE
Regards
Ati