Classes are overrated. Learn the writing script (for Korean you can do this in a week easily), after that it's time to start learning simple sentences (don't memorize words, instead memorize sentences). And LISTEN to as much Korean as you possibly can. Learning a language is easy, the hard part is not giving up. If you surrounded yourself with Korean everyday, time will do the rest. You need to find material that you think is fun and interesting, the moment it becomes boring or difficult you will quit.
For learning material try to use native material, anything made for foreigners learning a language sucks (anyone who has taught ESL knows this).
It's not easy finding learning material for Korean, but it's out there. Also, don't make excuses for yourself, either learn it or don't waste your time. It will never be the right time, you're always too old or too young or too busy or too poor or too rich or too fat or too ugly so just do it anyway.