Here is a link to 100 Best First Lines from Novels. I havent read much but here are my favourites.
Many years later, as he faced the firing squad, Colonel Aureliano Buendía was to remember that distant afternoon when his father took him to discover ice. —Gabriel García Márquez, One Hundred Years of Solitude
Happy families are all alike; every unhappy family is unhappy in its own way. —Leo Tolstoy, Anna Karenina
He was an old man who fished alone in a skiff in the Gulf Stream and he had gone eighty-four days now without taking a fish. —Ernest Hemingway, The Old Man and the Sea