Once the GPS gets a fix the NMEA sentences will reflect that. The sentences come as text strings so there’s nothing special to do except read them until they show consistent location. But if you really want to get technical here’s how to read NMEA sentences:
https://www.mathworks.com/help/fusion/examples/read-and-parse-nmea-data-directly-from-gps-receiver.html
If you dig a little you’ll probably find easy to use implementations for pretty much any platform (Arduino, Python, Java, smoke signal, etc. 
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As for baudrate, you can try the “usual suspects”, the refresh however I think it’s once sentence per second…not sure if that translates to one set of coordinates per sentence though