Looking at buying my first boat. AT 25 with 502 370 hours. What's some things I need to look for while I'm looking it over and driving it?

You need to have it looked at by a professional or at least by someone who knows what to look for.
There are simply too many things to check and no way to accurately tell what and how to look for stuff.

I would start by wanting to see a readout of the ECU to verify hours and at what RPMs.

Anyone know of any surveyors near white lake mich?

Make sure whoever looks at it check the transom and bulkhead stringer areas. I've seen a couple 25's where the tabbing is cracked. Easy repair if caught early.

This is the best advice you could get!!