Sell template+module

Hello, where i can get template and module where people can put sell own stuff like car or dog or furniture?

and of cource that work with dolphin.

Hello, You can select one of available templates on the 'Market' section. With regards to possibility to sell different stuff, you can use the 'store' module. I would not mind if you have a look at my templates

You can check both the Premium Store and Premium Classifieds modules.

It depends on exactly what you want to allow.  There is even an integration of a full shop module (open cart I believe) on the market.  Look around and ask questions of the module sellers to see if the modules will do what you want.  The built in Dolphin modules are lacking in some areas which is why improved modules are in the market.  However, the built in modules may be suitable as well.