first, learn some useful words, and say them to your korean friends in italki,, it will make you some good feelings;)
and you should be able to read in Korean,, so learn Korean script,, it's very important. and then just go to the GRAMMAR!
when you are learning grammar,, always practice your grammar with your Korean language partners ;) it will help you to learn them well, because Korean grammar is a little bit complicated :)
Good luck to your studies :)