Helo , i need to know how to create reference stage to sculpt from concept art ,help the greenie 
If I understand what you’re talkin about, then I think you’re looking for the image plane plug-un.
http://www.zbrushcentral.com/showthread.php?t=096435
you can get it from the download center for zb4. But it isn’t always the easiest to work with, so you might want to build your base mesh in a poly modeling program like blender or whatever you use, and then import into zb for sculpting.
i love to work with z spheres tho, i making some funny poses in no time , no box modeling can beat speed of z spheres , and also adjusting them , its just so fast , im new to computer , i used normal clay modeline plasteline , anything i could squeeze or model with my hands , this is very similiar , i tried max , didnt like modeling in it , it wasnt that difficult i just didnt like it at all , nothing like here
how to add new brush to palette , i found damian brush in one of tutorials , i would like to try it
And of course, try sculprtis and/or 3DCoat. 
Your tools in zbrush are zspheres, but remesh - reproject also.
Wellcome to the club :lol:
Waiting for your art pieces, have fun.
thanks for welcoming , and where to paste those new brush ?