This device has no chinese input so I have to go with english. For usa, it's almost immposible to get a proper job without the working permits. No one will hire a foreigner without any proven records unless you are super smart and well connected. Students with OPT are different because their employers will make the decision based on their performance before the H1 sponsorship. But, A LOT of NORTHERN chinese get here with travel visa then apply for Asylum immediately. If you are granted, you may get your green card. Anyway, there are millions of illegal workers in USA. If you are not commit crime, you should be ok. About the restaurant jobs here, you will make more than $3000 per month after few months of experience.