It is nothing that complex.. you need one letter from your vdc or munacipality.. that says somethin like... . "... mr. ABC son of Mr. XY and Mrs. YZ was born in abc vdc - 2, Tanahu, Nepal, on 25th Dec 2003".. or something similar.. The letter should bear stamp and signature of secretary.. If it is issued in Nepali, you need it's english translation, from kitab khana..