There are many good articles here and there. There is also Ycombinator, or other programs; as some guys mentioned here. Don't forget also that you have a working product that made money. If you prove that there is more expansion in your market, investors will come to you.
1. Read more about the subject (books, articles, issues, discussions...)
2. You may want to hire a lawyer to ask him few questions; or someone expert about fund raising.
3. Consider YC and other programs.
4. Keep some of your time for networking and making friends in that field.
Good luck. And remember, even if you fail, that won't kill you ;)
[Un/Related] So you are not a USA citizen. May I know how did you get your Visa and how did you make your company in the US?