Transfer to US under H1B

Hi

My Company is transferring me to US under H1B category to his sister concern based in New York.
The Company is in Jewellery Sector and has offered me $42000/- pa.
My main concern is the actual tax structure(however I have basic understanding about tax structure in US).
Where I can save money under this salary?
How much In hand salary will be(approx)
And at last What will be the absolute expenses?
I am planning to live in New Jersey in a rented apartment with my colleague.

Thanks.