[himitsuhieki]

I am adding my library to Calibre and it is tough since I have over 5000 books.
Currently I have my books sorted into a library I created that has a folder for each alphabet then a folder for each author. Within each author folder the books are listed author last name, first name - [series name #] - title when there is no series it is author last name, first name - title. Books that are read are read have a [read] at after the title. I also have a matching text file for each book that has the summary/description for the book.

Is there anyway I can easily import the library to Calibre keeping the same structure or as similar as possible? While disregarding the text files and tagging the books that are already read?
I would like to them be able to get metadata in bulk by author.