Many writers have the misconception that words drive writing, that in order to begin you have to have the right first sentence or paragraph. Nothing could be further from the truth.
If you begin with words, that's where you'll end up, lost in a quagmire of words. Why? Because words reside in the left side of the brain, which is the home of judgment, evaluation, and the Inner Critic. You know that voice inside your head that says, "If you're going to be a writer then you have to write this, not that. Not too much sex or violence. Don't be boring. Write a page-turner or don't bother..."