Creating Buy box/ deal analysis

[Noah Worley]

Hey guys, looking for some beginner advice.

Ran some hypothetical numbers with my bank and it looks like I could get pre approved for 400-450k. I'm looking to buy my second property next year, I could get a low/mid tier duplex in my area for 250-380. 

There's 50+ duplexes in my area I could buy, how can I narrow down that number to avoid the ones that wouldn't make good deals? Is there a general rule you guys follow when analyzing a multi family? How do you guys find quick rental comps in an area to see if you could cash flow?

I plan to house hack the duplex and rent out my current primary residence if that changes anything. Thanks!