The first line can be everything.  It’s the hook.  The downbeat.  The spark.  It’s placing a bet on the table (You liked the title?  I’ll raise you a sentence.)  It can be a whisper or a bombshell, but it has to be good.

One of my all-time favorites comes from Gabriel García Marquez in One Hundred Years of Solitude:

Many years later, as he faced the firing squad, Colonel Aureliano Buendía was to remember the distant afternoon when his father took him to discover ice.

It is simultaneously interesting, thrilling, dangerous, nostalgic, and not a little romantic… And the rest of the book is pretty fabulous too.

Begin how you intend to carry on.