International student taking up LPN

Hi, I am an international student here in the U.S. I am going to start LPN this Fall semester 2009.

I know that LPN are not qualified for working visa here. I am planning on doing the OPT after my course,work to gain experience and save up. then I want to go back to school and continue to ADN. what is the process in doing that? and if I go back and take ADN, take the boards after, am I qualified for a working visa?

hope you can help. thanks