Hi KoolHeart
The Big Book you probably saw was the 4th or 5th part. Try reading Part 1 - Harry Potter and the Philosopher's Stone...its small in comparison and very well written and realistic. That is the most amazing part about these books is that they dont have your stereotypical happy ending...the characters have so many dimensions and they are funny and real. I could go on and on here, but a few words are insufficient to describe the books or to tell the story.
Even my friends who do not like reading at all got hooked onto Harry Potter after reading the 1st book. If you dont like reading, try watching the movie 1st...