vt200 sn right click al60 reng car alarm

I have just got a car alarm with remote start for my 1990 Mercedes 230E (W124). The model badged a Right Click AL60-RENG, but is made by Victor which is a VT200-SN. The instructions that came with it are fairly vague, and I am unsure to a few of the connections. Is there anyone who can help with the following. I have included a copy of the wiring diagram. I also downloaded the not so clear installation instructions from here http://www.rclick.co.uk/information.php?info_id=1

I have worked out that the existing door switches connect to the driver door - cable (Blue), would I also need to make a connection to RED / black cable marked interior light -. and if so would I have to run it to the back light aswell as it is independantly controlled.

What would I connect to the WHITE/ black cable marked start +. It says on the sheet to connect WHITE/ black to positive of battery indicator on dash. What would this be for. I am certain that it is not the cable that remotely starts the engine as is a very thin gauge wire, I am sure that this is taken care of by the heavy green cable marked  +12v Start.

Where would I connect the blue cable marked 12Von (2nd).

The white cable marked +12V40A air conditioning, I assume that this could bring on the cars heater fan, my car does not have air con, where would I connect this to make the fan run at full speed.

Thanks for the advice, can it be installed without connecting the remote start, as it was just an additional feature which I am not too bothered about. What connections should I not connect to disable this feature.