Good afternoon.
Generally, a classification essay is exactly what you're describing. You do end up dividing a topic up into different sections because that is exactly what you're doing; you're compartmentalizing the items you are writing about. The trick of integrating each compartment comes in your transitions between sections. Smooth transitions from one section to the next will link all of the little pieces into one.
For examples of classification essays, type in "examples of classification essays" in your internet search engine; there are numerous guides and examples out there that will help you structure your piece.
Best of luck!
Regards,
Gloria
Moderator, EssayForum.com
Gloria, EssayForum.com