You should figure out what type of magick you would like to learn. Then look for a teacher based on that. What type of magick have you done so far? and would you like to pursue your knowledge on that type of magick or learn something else?
You should also find what your specialty is whether its what you wish to learn or not.
(I'm kind of new to magick although I know a lot about my field of magick, yet still have a lot to learn)