Purchase a Korean pronunciation guide and dictionary, available at any major bookseller or online through amazon.com, Barnes & Noble, Borders or Books-A-Million.
Take your pronunciation guide and dictionary with you everywhere. Read them in line when you're at the grocery store or post office. Spend time reviewing every day.
Purchase an audio course in Basic Korean and listen to it every day. In order to pronounce Korean properly, you need to hear it spoken. Most language courses employ native Korean speakers and are recorded on audio cd so they are great for review and perfect for listening on the go.
Peruse the course catalog of your local university and see if any Korean courses are being offered. If not, you might be interested in hiring a student tutor. The language department of your university will be able to tell you if there are any Korean students who are interested in teaching Korean. Another good place to search for a tutor is an online marketplace such as CraigsList.