Nuwan Wickramasinghe already gave the correct answer :-)
As long as you keep in mind to initially set the pages up as A5, and not as landscape A4. Your margins, columns, and page numbers will go astray. Always design (in InDesign) how it looks like the folded end result from a reader's viewpoint – not a printer's.
Oorspronkelijk geplaatst op Quora: How can I design and arrange an A5 booklet in InDesign software which will be printed in a normal printer using A4 paper landscape? I want to print it the simple way, staple it, and use it?"