Throw out your flash cards and grammar charts. Meet the Ancient Language Institute.
I know too many seminary graduates who have forgotten the Greek they learned in school, and since I'm planning on going to seminary, I am determined not to be one of them. I'm so glad I signed up to study with ALI. Instead of paradigms and flash cards, we have page turners and Greek conversations. If you can remember what it was like when you first learned to read, how you looked forward to finding out what happens next, then you'll have an idea of what it's like learning Koine with ALI.
My ALI experience thus far has been excellent and rewarding. Using the comprehensible input method, I have been amazed at how quickly I was able to attain a level of Latin comprehension that took me much longer to attain in French. The instructors I've had thus far, Luke Ranieri and Logan Kilpelä, have added a wealth of insight that would have taken me a lot longer to come to had I been learning solely on my own. I would highly recommend ALI courses for anyone looking to learn Latin.
If you want to come face-to-face with the great writers and thinkers of the ancient world, there is no replacement for reading them in the language they wrote and spoke. That is why I started ALI - to help students learn to read great writers like Sophocles, Caesar, and the Apostle Paul in their original tongues. With ALI, you start reading on day one, and you'll be proficient before you know it.