When i add a material to my object i get an panel that is like the one from [picture left] but what i need is an panel that is similar to [picture right]. Why is there a difference and how can i get the right one?
Switch from Blender Render to Blender Cycles, top of the main interface. That's your main problem - You're working in the old render engine.
Then... You have to set up a bunch of nodes in the node editor - Specifically a Glossy and Diffuse shader going into a Mix shader, which goes to the mesh's material output.