Obviously not coming at this from the perspective of a parent, and you probably know this already, but just:

make sure she can talk to you about anything. Because in this world, especially if she's attractive, she's going to get fucked over at some point. And I personally believe it's way more important to feel that you can trust, turn to, and rely on your parents than to feel that your parents are always happy with your life decisions.

Now, I don't think that's necessarily something you'll have a problem with, considering this is you we're talking about and you're pretty good at cutting the fat off of things and getting straight to the point and, well, conversing directly. Emphasize that no matter what she does you love her and that her happiness is more important than material "success" in life.

It's probably a really hard tightrope to walk, but I do feel that those parental/child relationships where the child knows that if they fuck up, they can go to the parent and get help first, judging second (or not at all, but we are not lovely angels) then they're going to go to the parent - which then builds the relationship - as opposed to, say, knowing they'll get judged first and maybe help somewhere down the line - are better.

Also, talk to her about sex. And body parts. And all of that.

This, my unsolicited $.02. It's what I believe is fundamentally most important for a good parent/child relationship, good communication and trust, so I can't help putting my nose in here a little bit. Hope you don't mind. I think the earlier you start to do these things the better. Once you set a habit of how you relate to the child I would expect it would be hard to change.