Harper Collins Children has a web link with work pages for popular children’s books. I may not always use their work sheets, but they do give me ideas on what I can and will use.
Teachers Pays Teachers is another great site for lesson plans. They do have some free ones available for us on a stricter budget. A lot of teachers have shared ideas and creativity that works for them.
If you have a favorite book, search the publisher on line. They may have ideas to go along with story.