What to do to start 3D design?

hi
I am interested in this work Where do I start?
What tool do I need?
Thanks

Pencil and paper. Design is an artistic skill. Everything else is just leaning a how to use specific tools, but all the tools in the world wont help if you dont have any artistic skill. You can learn how to use zbrush in a month or two, but artistic skills take years to develop.