Hi @Rebecca Lane,
Welcome to the wonderful world of investing in the Northeast! Where prices and taxes are terribly higher than most other parts of the country. With that being said, anyone can get into any business/market with enough tenacity, knowledge and focus. I am a proponent of knowing and starting in your own back yard so the knowledge you learn has a place to anchor in your mind. Each market is going to be different thus the type of deals that can profitably occur will change as well.
To reliably say if an investment in a particular area works you need to know what type of deal to pursue - rentals, flips, wholesales? The second is your target town, zip codes or city. As you probably know areas in NJ vary greatly. Newark is completely different from Bergen County! The same is true for areas in PA.
Pick a town or two in NJ within an hour or so and dive in. Figure out what deals make sense and then compare between those towns-this means being able to analyze deals, crucial skill. Then do the same for the places you wish to investigate in PA. Find some experts from those areas and compare the numbers with them!
Hope this helps!