How do i make a mesh or material

what software do i use

Try one of these free softwares. I recommend Blender but it takes some dedicated learning.

http://www.blender.org/

http://www.sketchup.com/

If you don’t have access to Photoshop to create Materials I recommend Gimp
http://www.gimp.org/

meat5000 is right Blender is good to get started