If you want to export the images from Lightroom to a USB or a file on your drive then please check the below links:
If you need any more help please let us know.
First select all the images in Library.
Then click Export, choose a folder to export to, and set the rest of the parameters under File settings,Image sizing and Output sharpening.
Assuming they will all be printed the same size, set the size in inches or cm, and ppi - 300 in most cases.
Thank You Serika.
Thank You Per Bentsen.
Thank You S