Thank you for your message.
Your description is way to simple and its not possible to answer it correctly.
In order to create some carousel (jQuery addon) you will need to stick up with general coding requirements which the carousel have (most likely on its authors homepage). Kentico is just like any other site, you will need to follow these rules like register jQuery, create needed structure and so on. All this can be accomplished in Kentico. First of all I would recommend learning how to create webparts here and then inspire e.g. with one of our webparts (Repeater with Carousel -> Repeater with effect).
Let us know which information you need.