As well as setting the correct page size in CorelDraw, you may also need to set the same page size (or larger, to allow for crop marks) in the printer driver, which you can reach by the preferences button alongside the printer selector.
I'm sure there is a way with limited functionality but I think you will need a 3rd party plug-in like "SignCut", or "CoCut".
if you want the full range of blade offset and pressure settings.
I could be wrong but we use Composer from Gerber Scientific as our bridge between design and production.
It's probably more than you need since we are exporting to a waterjet and 3-d router in addition to vinyl plotters.
Something like CoCut would be great for vinyl only.