A documentation symbol is a symbol that can be used for documentation purposes, this means it can be used on both schematic and PCB designs.
When making sheet borders etc. it is always best to make it as a documentation symbol as you can then add it to other drawings instead of redrawing it every time.
To make the rectangle with your chosen dimensions simply set the units and grid to match and draw the shape using the add rectangle tool, then change the grid back down to something smaller, select and move your shape into a more appropriate place. Do similar for all the little text boxes etc.
For the sheet name, number and number of sheets - add text that uses the "Design Field" for what you want.
Note, it may say "untitled" for the name until the sheet is named.
Sheet number should look like "Sheet <@SHEET_NUMBER@> of <@NUM_OF_SHEETS@>"
For the logo this can be easy or hard depending upon the logo itself, you cannot import a jpeg etc. only a dxf is successful for logo's and then you will have to rework/draw over the top of it most times.
Remember to also add the logo as a documentation symbol.
Practice, read the manual, experiment, if you see a button click on it, try an option.
you wont break CADSTAR.
https://cadstar.blogspot.co.uk/
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Sorry I missed finishing that post, if you look at the link you will find a tutorial on making a document symbol set.