Find a native speaker. One of the best ways to improve your new language skills is to practice speaking with a native speaker. They will easily be able to correct any grammar or pronunciation mistakes you make and can introduce you to more informal or colloquial forms of speech that you won't find in a textbook.
If you have a Korean-speaking friend who is willing to help, that's great! Otherwise, you can place an ad in the local paper or online or investigate whether there are any pre-existing Korean conversation groups in the area.
If you can't locate any Korean-speakers nearby, try finding someone on Skype. They might be willing to exchange 15 minutes of Korean conversation for 15 minutes of English.
