Tian Zi Ge (田字格) paper, A5
Character squares with dashed quadrant guides on A5, sized for short daily practice rather than long sessions.
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Little and often beats long sessions
Character practice works on repetition spread across days rather than on long sittings, and an A5 sheet is a sensible daily unit: enough squares to practice a handful of characters properly, few enough to finish. A full A4 page of the same character produces diminishing attention by the bottom, and the last rows teach your hand the sloppy version.
Fifteen millimeters is a working size
Large enough that stroke order and proportion are visible, small enough that a page holds a useful number. Younger learners benefit from bigger squares, up to 25 or 30 mm, because stroke control develops after the desire to write. Adults learning as a second language usually settle around 12 to 15 mm once the basic strokes are steady.
The quadrant lines are the teaching mechanism
The dashed cross divides each square into quarters and shows you immediately when a component has drifted across the center. Chinese characters are assemblies of components in fixed proportions, and a left-right character like 好 should sit roughly balanced either side of the vertical. Writing in an empty box teaches nothing about that. When the hand is steady, move to A4 for volume, or drop the guides entirely.
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.