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Zbrush starts in 2.5D Draw mode.
Hide the big shelf menu
Click Hide in upper right corner 
Sculpt a Primitive
Upper right Tool menu:
Hold down on a primitive to bring up a quickpick menu.
Select a sphere.
Click the Make PolyMesh3D button
Drag to draw the primitive sphere in your scene. (This is not scaling it, this is moving a camera.)
Click the Edit button in order to edit the 3D model. (Short cut hit T.)
You can immediately start painting to sculpt the geometry.
Press Shift to switch brush to smooth, try sculpting.
Use Zadd or Zsub to push or pull, (upper middle of screen).
Hit the first Brush button on the left to switch brushes.
Camera
Move the camera around by dragging the background.
Hold down the Alt key to switch between rotate and drag etc.
Try switching between Frame, Move, Scale, Rotate buttons on the right.
Grid
Press Floor just above the camera move tools on the right.
Paint textures Only
Select a base material from left side
Turn off Zadd and Zsub buttons near top center
Turn on RGB 
Tool menu on the right select Polypaint->Colorize
Select a color or 2 from the left
Start painting
Try switching brushes, strokes button on the left, second one down.
Bake the Texture
You must do this to get the texture into Maya.
Select Texture Map right Tool menu
Select Create->New from Polypaint
Export to Maya
In Zbrush
Zplugin->FBX ExportImport default Select Export
Select Snormals for smooth surface
Import to Maya
In Maya select: File->Import...
Hit 6 to see the texture
Export to Zbrush
In Maya
Choose your object(s)
File->Export Selection->
Select Files of type: FBX
Select Edit preset...
Under FBX File Format downgrade to Version FBX 2014/2015
(If FBX exporter is not available in Maya for export do this:
Windows->Settings/Ppreferences->Plug-in Manager
Find fbxmaya.mll put a checkmark next to Loaded and Auto load)
In Zbrush
Select Import from menu on the right column, or use the Zplugin->FBX ExportImport
Undo
Use Ctrl z or the Undo History scrubber to go back to an earlier iteration.
CLEAR THE SCREEN TO DELETE
Turn off Edit Mode
Ctrl n to clear the screen. (This only works in Draw Mode.)
START a NEW DOCUMENT
Use Document->New Document
Initialize ZBrush to set menus to default
Preferences->Init Zbrush
Questions
How do you bring back the big shelf menu?
How do you flood the whole object with a color?
How can we keep smooth normals with OBJ export from Zbrush
How do we import the material for OBJ from Zbrush to Maya
Encountered problems with Maya import files, if the polys have more than 4 points, the file is not imported into Zbrush. The Maya binary is not recognized. Maya ascci tries to work but does not.
Paint and sculpt at the same time
Upper right Tool menu:
Hold down on a primitive to bring up a quickpick menu.
Select the Gear3D
Click the Make PolyMesh3D button
Drag to draw the Gear in your scene. (This is not scaling it, this is moving a camera.)
Click the Edit button in order to edit the 3D model. (Short cut hit T.)
Use Zadd or Zsub to push or pull, (upper middle of screen).
Turn on RGB
Select a material from left menu such as BasicMaterialB
Select a color from the left to be used a fill for a map
Select UV Map from the Tool Menu on the right
Choose a size for the image such as 1024
Select Uvp planar projection
Select Texture Map from the Tool menu on the right.
Select Create
Select New Txtr
Tool menu on the right select Polypaint->Colorize
Select Polypaint from Texture
Select a color from the left to be used a fill for a map
Start painting
Try switching brushes, strokes button on the left
Add Divisions if you need to
Add more geometry to the poly mesh if you want:
Select Geometry in the right Tool menu
Hit Divide Use sparingly increases render time etc.
Bake the Texture
Select Texture Map right Tool menu
Select Create->New from Polypaint
Import into Maya
In Maya, hit 6 to see the color map
Open the HyperShade window to look at the material.
Turn the Ambient Color to black.
Render
Turn off Color Management:
Select Windows->Settings/Preferences->Preferences
Select Color Management
Uncheck Enable Color Management
Select Save
Press this icon upper right or middle 
Change Rendering Using to Maya Software
Click on the background of the perspective camera view to make it active.
Click on the  render in new window button located at the top of the screen.
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