Hi,
I would recommend you following. Create custom document type (
http://devnet.kentico.com/docs/devguide/defining_a_new_document_type.htm) with File Upload filed and some text field and let users to create document of such document type in your content tree. Example:
MainDocument
- ImageDoc1
- ImageDoc2
- Etc.
MainDocument is the one where you will add repeater web part which will be configured to display all banners under MainDocument (ImageDoc1, ImageDoc2 etc.)
In this way, banners will be displayed dynamically from some location of your web site and you can let your editors simply to create document of your document type with some image and text in your content tree and the content of these documents will be displayed dynamically by the repeater web part.
Best regards,
Ivana Tomanickova