Adding a module, like Sale items

How would I go about adding a new module for sale items? I noticed there is latest, best sellers etc all with uninstall links,

If I wanted to create a new one for "sale" how would I do that?

any help would be appreciated

Basically copy a module.
copy the controller, model, template ... front and back
Then edit them.

Basic php will get you a long way on this type of mod. But there might be an extension already.

never thought of looking for a module lol, but if not will have to copy one,

You could probably have the latest module do it for you. Have the sale items be the "latest" items. ...