First, separate the rings and enumerate. You must assign letters to the links starting with the letter "a" to the bond between atom 1 and atom 2 and so on. The arrow in the image represent the direction. The arrow in the image represents the direction in which you must form the name
Thank you very much, the numbering part I am clear now. But still the alphabet part I am little confused, sometime "a" and sometime "b" or "c" . Any reference book or journal please mention it will be very helpful for me.