http://www.memrise.com/blog/why-forgetting-is-the-secret-to-learning-vocabular/ I propose three key ingredients for learning vocabulary: 1. Context You need to hear, see, and use the word in a variety of contexts. Instead of studying vocabulary words in isolation, study them in the bigger picture - sentences. How do they relate to the real-world and everyday life? How would you use the word in a sentence? Are there certain grammar constructions that are either frequently used with it or must be used with it? 2. Emotion Having a strong emotion tied to vocabulary exposure helps us retain the information, although, for whatever reason, some random words may stick just because and others won't stick at all. For example, an experience that is funny, enraging, shocking, or sad will be more memorable than one that is boring. Thus, encounters with vocabulary in speech will likely be more memorable than just staring at words on a paper. A class full of laughs with a tutor may provide an extra boost in your learning process. 3. Need The vocabulary you study should be relevant to you. Of course, as you grow more and more advanced, you may branch out and extend your range. However, to start, try learning basic and common words and phrases. Then, choose words that you frequently come across along with words that you would need to know in order to talk about yourself, your life, your interests, etc. A spaced-repetition system or online flashcard and quiz tool (memrise.com, ankisrs.net, quizlet.com) may assist you in retain vocabulary, grammar, etc. However, many people have learned to speak a language fluently without using these additional tools. For something you have less exposure to or time to practice with, try squeezing in any time you can get during transit, your morning routine, exercise, housework, etc. Read, listen to audio, watch movies, practice speaking and writing, and use online study tools such as ankisrs.net.

My favorite resource is: talktomeinkorean.com It's very organized and focuses on grammar.

TIP: You should probably try learning and studying from proper, colloquial Korean instead of from internet language and slang. Haha. Imagine an English learner trying to learner proper English from Facebook "u ain't gonna wanna see this 2nite". Yea, try finding and using reliable, correct resources. Start with 한글 (the alphabet) and then just work on a little bit of everything. You want to create balance between the four skills (reading, listening, writing, speaking). You should continuously be working on learning new vocabulary (on a daily basis) and new grammar (on a weekly basis). For speaking, you need to speak. This could be with a friend or teacher. Or you could talk to yourself or make recordings and share them with natives to correct. (SEE ALSO http://www.italki.com/discussion/91436) For listening, you need to listen. This could be during conversation with a friend or teacher, or it could be through music, movies, and TV shows. For writing, you need to write. Then you need to get feedback (constructive criticism), take note of the corrections, and make revisions and use what you learn in new entries. I suggest using italki and lang-8. You can share it with the community, friends, or teachers. For reading, you need to read. This should be whatever interests you. Look up what you don't know, make note of it, and use it yourself.

Instead of specifically looking at vocabulary lists and flashcard sets, you could just go au-naturale. Read and write. When you read, if you don't know a word, look it up, add it to your notes or a flashcard set, and then trying using it yourself in a sentence. Study examples and pay attention to context and common structures. Post practice sentences on here for us to correct :) Try and write based off of a prompt or idea. Don't know how to say something? Look it up. And you know the rest. Haha http://endic.naver.com/?isEngVer=Y

I think you should select books based off of your interests, current language proficiency, and goals (both overall and on that specific "mission". Ex. Improving reading speed, increasing vocabulary, reading along with audiobooks, entertainment, etc). Overall, reading material at or a notch above your current level will be best. Without challenge, there can be no growth. You won't acquire new knowledge of idioms, slang, vocabulary, grammar, colloquialisms, culture, etc if you're only working with what you already know. Choosing reading material far above your level, unless perhaps you're skimming for some new information and not for understanding, is not a good idea. It can be frustrating, overwhelming, and a waste of time trying to muddle through advanced (relative to your current level) grammar and language. This applies to audio and listening material as well.