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Parkher,
If you still have the original files, you could create a new library and re-add all of the books. You could even do so twice, once reading metadata inside the ebook and once again based on filenames. Then look for duplicates, keep the better book record, and merge or delete the extra. Neither method is perfect, errors will occur. The suggestion to add small groups of books allows you to notice and correct any problems quickly.
You can also download metadata from the internet, but a warning: downloaded data overwrites existing field data. It's best (at first) to use this in a limited and per book fashion.
Regardless, you will probably want to manually tweak the information in your book records to reflect your personal needs.
Each user's needs and methodology differ, but essentially we're all doing something similar when it comes to managing our ebooks through calibre. This effort is made easier by new features to calibre, and its plugins, the programmers are able to devise.
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