I'm a first generation founder, have mostly international friends, and have worked with foreign based startups.

I'd give the same advice that I would give startups based in the US. The only things I can think of that could be additional advice would be:
1) Make sure you've interacted with Americans before. Depending on what country your from, our way of speaking and interacting might be hard to adjust to.
2) We work longer hours in the US than in most other countries. Adjust to that or risk being considered lazy.
3) The startup community can actually be pretty 'small', lots of people know each other. If you're coming from another country it might be useful to network with a bunch of startups already in the US to have people start to know you before you talk to investors.
4) Try to find some advantage to your startup from the fact that you operate in the country that you do, otherwise it might be seen as a disadvantage. Even though the world is very connected, investors prefer to be geographically close to their investments.
5) Make sure to read up on US patent law and FDA regulations if either of those are relevant to your product. The patent laws recently changes, and the FDA is much harder to get past than equivalents in other countries.