I had a blast with this step. I already had an account on LibraryThing but did not use it often. I set up an account on GoodReads and fell in love: GoodReads seems more user friendly than LibraryThing. Adding new books is so easy, as is adding tags, putting books in categories, and so forth. I stayed up far too late one night and wound up adding over 100 books.
I really enjoyed seeing how libraries use GoodReads. Many have established a reading club for adults, teens, or children. Some sites say that when you write a review, you are eligible to enter a drawing for a prize. I'm in a "foreign authors" book group, and GoodReads would be a great place to chat with others if you miss an in-person session. Also, the clubs have a "book shelf" feature, and that would be a good place for my school library to display new children's books.
my read shelf: