learn how to read and write if first, it will be the key for speaking

Thank you for your answer, It was helpful to me.

You should learn Hangul first. It's really pretty easy and should only take a few days. While you're at it, install the Korean keyboard on your computer (it uses the exact same keyboard as English, but of course different letters on each key). Typing in Hangul is also pretty easy (it's cool because all the consonants are on the left hand, all the vowels on the right). You can use Romanization to help you get the sounds of the Hangul, but as soon as you are comfortable with the right sounds, STOP using any kind of Romanization.