No you don't. Actually, most schools prefer that you don't speak Korean when you teach. You'll be teaching back-to-back with a Korean teacher so the Korean teacher will be doing all the Korean speaking. You're purpose is to take the lessons and apply them, in English, in ways that can be educating and entertaining for the students.

Not if you are teaching in a private language school. There are a few private school positions out there that are like that but they're rare. And, when they are that way, the Korean teacher will usually be sitting in the back of the class, marking journals. They are there just if you need them for something.

In public school positions, you will lilkely have to teach with a Korean co-teacher at the same time. You'll also have to do lesson planning with them as well.

We don't have any of those positions, as of yet. Most jobs are set up so that the Korean teacher goes in and teaches grammar and expains the lesson using Korean and English. They basically work the comprehension end of things with the kids. Then you come in and use the lesson material with the kids in various situations to get them involved in using it. Most schools are quite open to you supplementing your lessons with fun activities and such.

All schools will provide books and other material for you to use for your lessons. As far as a "set" curriculum, many employers don't mind if you stray from the lesson a little as long as it's doing something educational or interesting for your students. More often than not, employers encourage you to supplement your lessons with fun and interesting activities.