To be a responsible teacher with self-respect, music knowledge is essential!! Once you know you are inadequate (also for myself), you will have good drive to learn. To share with you my experience, I first go to book stores and find that there are quite a lot of books about theory and history. You can pick up some you can understand. The more convinient way is visiting 'wikipedia' on the internet daily. Then you can accummulate the knowledge.
In your level, maybe you can start teaching so as to gain some experience. Of course, if possible, maybe you also do performing so as to keep on your learning and growing.