@lelu - it depends on what you want your custom column to look like and contain. For instance do you want a #read column that is of type Yes/No, or do you want a text column containing the word "Read"?
You say "tags" above so here are instruction for working with your existing "tags" column. You could do it using a separate custom column (or multiple) if you wanted.
What I would do then is go to Customize plugin, double-click or right-click on the "read" shelf and choose "Edit sync actions...". You will then want to setup two actions:
Action: Add value to column
Column: tags
Value: read
Action: Remove value from column
Column: tags
Value: to-read
So when you have finished reading a book, you would use the "Add book to shelf->Read" menu from Calibre (or update the Goodreads site directly). Then use the "Sync from shelf->Read" menu item which based on those sync action rules above will result in a "read" tag being added and a "to-read" tag being removed (if found).
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