[komitsuki]

Just learn the alphabet and be prepared for pronounciations not native in your language*.

* examples:
1. tensed stops (kk-, tt-, pp-)
2. j-, jj-, ch- pronciations are extremely different from English
3. be very careful for certain vowels

There are a lot of consonant assimilations between syllables in Korean. Be very aware of that if you want to talk like a near-native speaker.

Basically you will learn a Seoul-based dialect at your school. You might encounter several dialect speakers if you visit South Korea.

That's about it.