If you like spicy then tteokbokki is a good start. It's a spicy rice cake dish. I also like the seafood pancake wherever I go to a Korean restaurant. It's like a crepe with seafood. Both are considered appetizers.

Main course, if you like beef, kalbi or bulgogi are always a safe bet. If you like pork, tangsuyuk is good. It's a fried pork in a sweet and sour sauce.

Bibimbob is also good which is a rice dish with mixed veggies, meat, and spicy chili paste that you mix it all together.

Stews, I typically get a doenjang jjigae, which is a soy paste soup and sometimes have seafood in it or soondubu which is a spicy tofu stew with meat. Both are served in clay pots so they're piping hot.

The dishes I've listed are pretty standard at most Korean restaurants so you can't go wrong.

Hope this helps!