First...you are entering teaching in NJ in a very unfriendly climate so you aren't in the position to expect or demand much of anything.
Second...many districts will only hire you at step one since you have little to no teaching experience...maybe a generous, well-off district might give something for the subbing...but I doubt it.
Third...unless a district desperately needs a physics teacher, they won't jump the scale in an effort to save the bucks.
Have you been listening to the most anti-public education governor we have??
I really do hope you get a jo in educationnif that is what you are after. Just don't expect too much in this climate.