1:50 / 1:100 (A3) Help

So this question has been asked before, but there didn't seem to be an answer. I have a drawing that is currently in metric. I have been asked to export the diagram in 1:50 or 1:100 for A3. I created a new print format, selected a landscape, print to pdf and then select the 1:100. I offset the drawing to get it in the page. Am I doing this right or do I use the export to PDF (But I have no idea how to set the properties for this so it match 1:100). Any help and advice would be appreciated.

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