Hi Andi,
It's prbably best to go the pencil and paper route, but try this:
1. Open a blank word document
2. On the toolbar go to 'Insert' then select 'Table' and select one 8 columns wide by 12 rows tall
3. Right click on the table you've just inserted and selected 'Table Properties' from the menu that comes up.
4. On each of the little tabs that apper, set the 'Row Height' and 'Column Height' to 2cm or 2.5cm.
5. Cross your fingers
That should work, but you may need to play around with it for a while to get it right. like i say, pencil and paper may be best!
Dave