Focus basically 100% on her. Read "How to Win Friends and Influence People". People love talking about themselves, and don't talk about yourself at all. Only talk about yourself if she asks and even then, keep it short and don't give too many details. Women want a man who is a mystery and who they have to take time to pry open and discover. Don't just play 20 questions though. When you ask her a question, really dig deep on it.
"So what is the best vacation you ever took?"
"Alaska"
"Oh wow, I've never been - tell me all about it!!" (with excitement and genuine interest in hearing)
(Now she starts telling you all about it. Look captivated and interested. Be in the moment. Don't think about what she'd look like naked or what you're going to say next. Really listen and be present)
"Oh cool - you saw the wales on a boat tour. Are they really as big as they look on TV?" etc etc.
I find it really helps if you can go a bit deeper and get to the emotional level. Ask them how they FEEL about something, or how an experience made them feel. Ask them what they are most passionate about in life and then ask followup questions about why - and what kind of "feeling" they get from it. You might then relate to them about how YOU feel about something - either something similar to them, or something else that gives you a similar feeling to what they described. For example, if she volunteers with sick kids and it makes her feel love, you might talk about how you feel love when you volunteer at an animal shelter etc. But be honest and don't make things up.
Playfully tease her several times if you can. Like, pick on her, playfully. For example, today I was talking to a girl and she was writing something with pen and paper while I was on a laptop. I looked at her with a questioning eye and a smirk and said, "Wow, do people still actually write with pen and paper?!" She talked about how it was "meditative" and said some other new-agey stuff so I said, "Let me guess, you spend a lot of time practicing yoga don't you?" with a smile. Just playful fun teasing stuff - nothing mean spirited. Another example: She tells you she has three cats. You say, "Three cats? Oh Jessica, I don't think this is going to work!" but you say it with a smile. Don't go overboard with this. A few teases during the date should be fine. Teasing is not a "neg" and is not meant to knock her down a notch, it's meant to convey that you are confident and not an ass-kisser that is only going to say the most flattering things possible to her. You do take a bit of a risk when teasing her and that alone conveys that you aren't an overly interested needy chump like 95% of the guys who talk to her. But from a risk standpoint, the risk is low because unless you are super awkward with how you tease and you actually say something mean, then she should laugh at what you say and if she doesn't, it's a red flag and you should move on immediately.
Lean back in your chair. Take up too much space. Be relaxed. Act like they are trying to impress you, not the other way around.
I'd avoid talk about exes entirely, but if she brings it up, you might ask a few questions to try to get some intel about what caused the breakup, who did the dumping, and what the reasons were so that you can factor this into your decisions. But exes are usually a negative topic, and you want to keep the conversation focused on positive, fun, exciting, pleasurable things. What's your favorite vacation? What was the best party you ever went to? What's your favorite album or movie? Tell me about your best friend and all about why they are your best friend. Ask if they have pets and if so, ask about them - people love their pets and love to talk about them (especially those crazy cat ladies). All fun stuff that is going to make her associate her funnest, happiest memories with you.