Your 1965 car was built with a dynamo for charging the battery. This requires an external regulator with multiple connections. Most of the electrical loads are placed on its A1 terminal hence advice. The equivalent for a newer alternator which may have been retro fitted is the main output terminal usually labelled B+ which connects directly to your battery but provides easier access.
You are lucky that for the most part there are no electronics on your car as it left the factory just basic electrical stuff. If you are still a little hazy about connecting lights an auto electrics engineer should be able to sort it for you in short order.
