How to set up 2 A5 pages to print on 1 A4 sheet

[paulranger]

I need to type set and print 2 x A5 pages in a document file onto a single 
sheet of A4 paper.
  - this shows 
 the back cover (text left justified) of an A5 size pamphlet
 with the front cover (containing an inserted picture with text being centred 
inside the line drawing insertion. being centre justified.  
 The contents of the pamphlet will consist of 2 additional A5 sized pages of 
text - both left justified to be printed on the blank side after initial 
        back cover /front cover printing.

I cannot find how to perform this set up from the open document work space.  

I cannot work out how to set the page orientation to landscape rather than 
default portrait (upright) orientation. Further, I cannot find how to set the 
document size to A5.

I am grateful for advice fellow AOO users may be able to suggest.

I am running AOO 4.1.3 on iMac.

Sincerely, ranger1.