Things you should definitely NOT talk about: Family Background (and childhood abuse/bullying), Marriage, Money, Politics, Religion, Secrets (yours or anyone else's), Sex, Sexual Experiences/Identity, Work/School Drama, or Your Ex (and why you broke up).
Instead, talk about your passions, dreams, and ambitions. Express only excitement, joy, and optimism when doing so. Pepper your talk with questions like "How about you?" or "What do you think?" to give your date ample opportunity to respond.
Remember, you are having a conversation, not holding a lecture; a first date is not an opportunity to deliver a soliloquy or an exposition; it is an opportunity to pique your date's interest in you as an intelligent and upbeat person. If you cannot say one thing in three breaths or less, then you are saying too much about it.
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No love for Hamas, Hezbollah, Iranian Leadership, Islamic Jihad, other Islamic terrorist groups, OR their supporters and sympathizers.