Replying to I'm a noob, help

So, I'm fucked. My girlfriends Vietnamese father is taking me fishing this weekend. He was one of the last people to leave Saigon, ex military. He is, to put it bluntly, intense. He fishes every day of his life now that he's retired. He's completely blank and unreadable in the few times I've met him, and he could very well be taking me out here to dump my body into the lake. What's worse, I love his daughter and if I have any say, he'll be my father in law.

I have a rod. It's a piece of shit, but it'll work. What I need is some advice on what to do, and possibly more important, what not to do. He's not a talkative guy, so I doubt I'll get much out of him in the way of advice. Any pointers for a noob who's about to fish a lake with his girlfriends dad?