The same way we learn any language! Start with the right foot: learn the alphabet, numbers, some easy words... learn how to pronounce well some short easy words. If your foundation is solid, you will find it easier to move to the next level. Take it gradually. 1. Buy textbook and a grammar for the basics. 2. Make friends with Germans to practice what you learn on your own. 3. Find a teacher on italki. Teachers are supposed to know what works best for a student, however you know yourself the best, you know what is the best way for you to memorize and apply your knowledge.