Start talking to natives as soon as possible. You will start to pick up on their accent, pronunciation, everyday expressions, not usually taught in grammar books. To learn a language is to use it as a everyday tool for communication, so start communicating :)
talktomeinkorean.com
memrise.com
howtostudykorean.com
dic.naver.com
dic.daum.net
Also find some blogs, tv shows, any written or digital content to practice your Korean or pick up on any new words.
Just remember to have fun and be relaxed when speaking Korean, even if it's not perfect, Koreans will talk back in Korean if you try to say what you are feeling without being nervous. Good luck!