I know a sister, who was nurse back home. After taking some extra classes, she was able to apply for the Nursing License. It wasn't easy to enroll in those classes though. She waited for a while and followed up. Now, she works for a hospital in California. 
You know beautigrl, to do good in US, you should ask what you don't know. Don't be shy. There are lots of good people out there. Be positive. If you need support, we have a whole community on Sajha. 
Take care.