I am looking for the CREATE TIN tool in the 3D Analyst toolbox, but I can´t find it. Any ideas why I can't find it?
First you need to enable the extension (if you have the license for this):
Create TIN (3D Analyst) http://resources.arcgis.com/en/help/main/10.2/index.html#//00q90000001v000000
You can search for this:
3D Analyst tools >> Data management >> TIN >> create TIN