Jobs in USA(H4 Visa)

Hi All

Am moving to Edison,NJ in Feb 2015 and I want some info regarding jobs in USA
1. Am coming in H4 Visa and thought of applying for H1B in April 2015 through a consultancy. But I want know how can I trust the consultant people? Are there any changes of being any fraud work?
2. Am also interested in this Non-profit Organization which will allow us to do volunteering job, mostly in schools and libraries, Is it easy to find a job in that??\
Are we paid for that?? Any idea about how the pay like and the work timings?

I have a master degree in computers and work here in an MNC in India.
Pls lemme know what I can do .
Thanks
Arthy