mastersian thank you very much for supporting the project!
Unfortunately, there is no user manual, but I am planning to make educational video, as this is the topic that generates lots of questions.
As to ordering in personal albums, normally faces are sorted by date, starting from most recent ones. However, you should take into account that suggestions mess up with the sorting order a lot. They get added to the beginning for confirmation and then to the end when they are confirmed. Nevertheless, you always can switch to Folder view and then go back to People view in order to restore proper sorting order after it has been messed up by active work with faces.