You actually get a kit that looks to have building tools in for clay work. Most of it is first rolling out the clay and then cutting it and then folding it to the shape you want other methods you roll the clay into a tube or pipe and then cut it in disks. It depends on what you want to do.
Here’s a site with SOME information on making decals.
Here’s a site which explains why decals might not be a good idea and talks about silk-screening onto to your ceramics instead.
Hope this is of some use to you.