A lot depends on what qualifications and experience you have that could be applied to a new job now you're in the US.
Without previous experience or some specific qualifications you'll be hard pushed to get anything but an entry level position but it is always possible to work your way up if you can prove you are a quick learner and willing to do what it takes.
If you have previous experience in a certain field then I would suggest trying to use that to improve your chances of getting a job offer. I would strongly suggest the use of staffing and temp agencies to help you get a foot in the door. Being new to the US you won't have the contacts which help you to find out about new openings. A staffing or temp agency will provide the crucial link between newly available employment opportunities and you.
A good staffing agency can also provide more information on your skills, experience and immigration situation than is normally possible in a resume. This extra info could be the difference between getting an interview and not getting onto a shortlist.
Good luck with your job search
Mark