Hi springweb,

Probably the best way to learn how to make a custom slider is to look at the image slider block that comes with concrete5. You can use it as a base to work from.
https://github.com/concrete5/concrete5-5.7.0/tree/develop/web/concre...

Before you do this, I would recommend reading through the developer documentation on blocks to get an idea of overall structure.
http://www.concrete5.org/documentation/developers/5.7/working-with-...

The developer documentation is a work in progress, so I also recommend these two links on the concrete5 API.
http://sisusolutions.ca/index.html...
http://www.concrete5.org/api/

There are a bunch of image sliders that do pretty much what you want already in the marketplace (5.6 and 5.7). Some free. All pretty cheap. There is also the basic core slider block in 5.7.

So pick a starting point that comes close and adjust the markup and css with a custom template.

I found this quite helpful:
http://c5blog.jordanlev.com/blog/2011/12/build-a-slideshow-block/...