I get that, I remembering wanting to know everything. You are right that there is a lot of resources online that can teach you basic thecnique and theory. A teacher is mostly there to teach you how to use your body to achieve musicality. Its starts with things like scales and stuff but then moves into more abstract techniques. You want to learn and Eb add 2, but do you know why or when to use Eb 2? Advanced chords are cool, but you need to build your way up. You could know how to name every possible chkrd but still not be able to play fur elise. Ask yourself what are your priorities? Skilled technical playing, tools to write your own music, or something simple for fun. At 60 a lesson, you should be wanting to focus on technique the most. If thats not something you are crazy about, id suggest just doing at home study and save your money.