How do I talk to a woman that I like?

There is this woman who I find to be really amazing and very good looking however there is a slight age gap between us, she is 22 and I'm 29 : /

She is very successful with a good carer and I'm just an electrical engineer witch doesn't really appeal to most.

She is an American lady who lives here in the UK and she has agreed to meet me for a friendly drink witch I wasn't expecting, however I'm really scared now that I'm going to totally mess things up by either boring her to death or saying the wrong things. I have a habit of being uninteresting and my life isn't really that exciting. I know there is a very small chance that she is interested in me otherwise she wouldn't have offered to meet me. Most American women here wouldn't give me the time of day let alone anything else so I really want to give this a try and see what happens although I'm not expecting much but at the same time I can't just assume things or tar all women with the same brush.

How do I talk to her without sounding too keen or clingy or interrogating?

I want to ask her when and where she wants to meet but before I do, I need to talk with her more first.

What would be good conversation ideas?

What are typical things that men say witch is a big no no?

I understand that this is just a "friendly drink" and "not a date" but I want to try my best to make a good impression so that if nothing becomes of it, then at least I can walk away knowing that I've tried.