Resizing is done in the export dialog settings.
Use the crop tool to get the correct aspect ratio (shape) for the print if you don't want margins on the paper.
If you are printing to your own printer-
There is no necessity to re-size or crop!
In the Print module-
In the Print / Layout Style Panel- Choose "Single Image / Contact Sheet"
Choose your paper size in "Page Setup"
In the Print / Image Settings panel-
A check tick in "Zoom to Fill" will crop your image to the paper format. (Drag the image to re-position)
No tick in "Zoom to Fill" will print your image as you cropped it in the Develop module (if you did a crop).
In the Print / Layout Panel-
Set the cell size as required (Sliders at Maximum will fill the Paper format)
Set an change to margins (Sliders at all Minimum will fill the Paper format)