How to analyze a rental market?

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Hi everyone! Been lurking here for a couple weeks and am starting to post today. Great site with tons of resources.

I'm a recent college grad planning to buy a home in the suburbs outside Philadelphia within 1-2 years. It's about a 30-40 minute drive from the city, and public transportation is also available. My wife and I are also interested in real estate investing, specifically buy/hold/rent strategy. We wanted to buy a duplex to live in one unit and rent the other (as often recommended for new investors), but we're not sure whether the area we're intersted in has a strong demand for rentals or not.

Does anyone have any recommendations on how to analyze whether an area is good for rentals?

Thanks for reading!