Good luck. 20 min blinds is not bad (my local casino is 15 min for thiers). You have the right idea of playing like a Turbo but it will still be quicker than you expect.
I recomend keeping your ears and eyes open and mouth shut as much as possible.
With $50 you should be up against a good range of opponents. From "I dont know what beats what?" to Online shark looking to change it up for a night.
Obviously read for tells
.. body language and hand motions are where the more obvious tells are.
Look to your left before you act to get reads on hands behind you (this has been for me the biggest benifit of playing live). If you have a read on the people behind you, you may be able to see a raise or monster coming behind you.
Live is different but its all poker. Good luck!