There should be no school specializing in bartending in Changchun. You can search Changchun's bartending schools on Baidu, but as far as I know, none of the well-known domestic bartending schools seem to be in Changchun. If you want to learn how to mix wine well, I suggest you take a long view, look around the country and go to a good school to learn. I recognize Horizon Bartender Training Base, which is very professional, but they are in Chengdu, not Changchun.

As for the lack of experience and knowledge in bartending, it doesn't matter. Generally, bartending schools teach from the most basic foundation, and it is ok to not understand.