Hold that Explosion, Thank You!
One of the most common rules for modern novel writing is this: "Start with action!"
The idea being, if you can catch your reader's attention with some exciting, explosive, action-filled scene, they'll have to keep reading to find out the whys and wherefores.
Personally, I'm not a fan.
The best books I have ever read start with a certain amount of conflict, true. But they don't start with those big, movie-sequence, action scenes.
Because, really, why should I care that some gorgeous woman is being chased down by the steely-eyed gunman? I don't know her or her story, whether or not she deserves this chase. Why should I care if the stoic soldier fights off the marauding hordes at the wall of his city? For all I know, I should be rooting for the marauding hordes!
Much better to start with a smaller conflict. Give your reader a chance to get to know your character. Give your reader some tension and some questions, but don't give them BIG tension or HUGE questions just yet. Let's see that character in play for a bit and get attached first.
Think about your opening sequence. Too much action? Too little? How is your character introduced?