I am Catholic, and have intermittently attended a Tridentine Mass (i.e. latin Mass), although I usually attend the Novus Ordo. You can find a parish near you with this web-site:
Please don't accept communion if you are not fully in union with the church, and have not had a recent confession. Accepting communion would be a sign to everyone that you are fully accepting and in union with all that the Catholic Church teaches. Not only that, but if you have not had a recent confession, then you would be accepting "unworthily" and therefore committing a grave sin.
As for what to expect, there are usually latin/english missals at the entrance, so you can follow along if you do not know latin (or the Mass in general). My suggestion would be to sit near the back of the church so you can view the whole congregation, or you can sit way up front to view all that the priest is doing close-up (don't use the front seat, but sit maybe 3 or 4 back). It is very ritualistic, compared to the free-wheeling protestant bible churches.
I believe you will find the Tridentine to be very solemn and serious. Don't expect everyone to smile and do high-fives, most people are there to pray and not chit-chat and make best buds. These people take their faith seriously. It used to be that there was fellowship after Mass in the church hall, and that would be the place to approach people and talk, but with Covid-crazy taking over the country, there might not be that opportunity.
Good luck and God bless.
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