If nothing came out of the printer, it's likely that you selected a different printer than the one you expected to print on. Click the "Print" toolbar button to launch the Print dialog, then check to see what printer is listed at the top of the dialog in the "name" field. Is this the printer you meant to print on? If not, set it to the correct one.
If you got a blank page from the printer, you probably either tried to print a blank label -- one you hadn't added any images, text, or shapes to -- or your hard disk is nearly full. If your hard disk doesn't have at least 200 megabytes of free space, your printer driver is likely to have trouble creating the temporary files it needs to print with.