For cars, see the description of the mod on the mod's web page 

To install the map you just have to take the file Villa Business 1.1.xml 
and to put it in the folder : C:\Program Files\Rockstar Games\Grand Theft Auto V\menyooStuff\Spooner

To load the map, launch Menyoo then go to Spooner Mod then Manage Saved Files and load Villa Business 1.1

enjoy !