If I may ...
Take an early trip to Baltimore, couple a days or a week in advance of your trip to get an idea of the area of the stadium. There are parking structures, garages etc, right close by. Also, the Ravens website has partnered with Panda Parking,
https://www.parkingpanda.com/mt-bank-stadium-parking?ref=nfl-ravens, so you can reserve a parking spot well in advance. It is still a very good idea to go days prior, (during the day), to an event to see what you will be facing as to traffic, streets, since it will be your first time to the city of Baltimore. Highly advised. It is an old city, with old city narrow streets, and with many "one way only" streets, and can be easy for a first timer to get flustered and misdirected. Call it a sight seeing trip. Good luck.