You could consider joining Classical Guitar Corner (CGC): https://classical.guitarcorneracademy.com/
where you will have access to learning videos, learning materials, feedback on your playing (if you wish), and teachers through the forum and short, online lessons and critique (call Office Hours).
The course work is highly structured into four Levels (but about to change to Grades 1 - 8, more or less equivalent to Trinity College, Royal College, etc.). It is especially geared to adult learners. You can follow the material in any order, but it is also structured in order as courses covering theory, technique, exercises, sight reading, and repertoire. The material in the courses move in small chucks, so is not overwhelming. Of course, it is essential to practice methodically to make good progress. If you wish, you can submit your work (technical exercises and repertoire) through videos for formal examination at specified times of the year.
Costs vary according to the membership tier you elect, and you can join as a monthly member and upgrade to an annual member later. These is free material to get a sense of what is in store with full membership. I know a number of existing members are from China and Hong Kong. I have been a full (annual) member since December 2016.