State tax filing

The information you entered on your federal return should flow over to your NJ return.  

New Jersey uses the Gambling Income Statement which flows to line 24 of your NJ-1040.  The total gambling winnings are reported net of your gambling losses on your NJ-1040.  You do not have to itemize to claim the losses in NJ.  

So if you look at the forms in your return, as long as you entered your W2G and then entered your losses from the W2G in the federal section, you will see your net winnings on line 24 of your NJ 1040.