Schools with full transmission of Xing and Ming methods are rare and difficult to get in contact without a special attitude.
As for the nature of the Dao, unless we can meet with somebody able to "communicate" with it and who can explain in simple words its nature it would be difficult to know something about it.
Of course reading scriptures can also help, but here too a special attitude is needed to get some insight.
My 2 euro cent
You already know all there is to know of the Dao - as the noise stops and the illusion subsides you will find you have always had all the "answers". It is surprising how many of those answers will be found in nothing.