Need tool to randomize text in a post

In order to present a post the way I want, I’d like a bit of code or a plugin or something that will do this for me.

On the front end:
On this post, there will be some introductory text. Below that will be a little window that displays a single sentence. Beside that is a button that, when pressed, spins a bunch of other sentences through the window (like a slot machine), eventually landing on one. The button can then be clicked again, and a new sentence is displayed. Etc.

On the back end:
I’ll enter, say, 50 or 100 sentences into the back end. This will obviously drive the text that’s given out on the front end.

Wishes:
That the window in which the text appears has an image around it so that it perhaps looks something like a slot machine.

Any thoughts on the best way to accomplish this? If I’m going to need to have it custom-made, where do I even go asking for it. That is, if I go to Freelancer, what programming language area am I going to be putting this into?

Thanks for any help you can offer.