Zaner-Bloser handwriting paper
The three-line ruling with a dotted midline that Zaner-Bloser uses, at three-quarter inch letter height.
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The proportion that defines the ruling
Zaner-Bloser keeps one rule throughout the grades: the distance from one baseline to the next is 50% more than the tall letter height. A half-inch letter space gets a quarter-inch skip below it, making three-quarters of an inch baseline to baseline. This sheet holds that ratio at whatever height you set, so changing the letter size moves the skip with it rather than leaving the spacing wrong.
Letter size shrinks almost every year
This is the practical difference between the two big US systems. Zaner-Bloser steps the letter height down nearly every school year, so a child moves through a sequence of progressively smaller rulings. D'Nealian holds one size for up to three years. If you are printing practice sheets to match what a school is using, the height is the thing to get right, and it is worth asking rather than guessing.
Vertical manuscript, then a separate cursive
Zaner-Bloser manuscript letters are built from straight lines and circles and stand upright, and cursive is taught later as a distinct system. That is the opposite of the D'Nealian approach, which slants the manuscript from the start so the transition to cursive is smaller. Neither system needs different paper for manuscript, but the letterforms you teach on it are not interchangeable.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.