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You rock! That explanation helped me to improve time on making grid... I always lose so much time calculating all areas... Great job... Keep going!
With the rectangle selected, go to Object > Path > Split into Grid.
As for the size of a page, that depends on the content and how you want to present it. The ideal line lengths for text are between 35-75 characters (an average of 65 is ideal) and you need to decide for yourself how you want to layout the text on the page. 1-3 sentences can be put in wide or short paragraphs, but any more than that and the text gets harder to read. Long lines make it harder to find your place when you jump from one side of the page to the other and short lines make your eyes jump around too much.
Text can also be more pleasing to the eye when it's asymmetrical on the page. You could choose a 4-column layout and put text on each page in only 1 column on the side of the page. If the columns are slim, you could put your body text across 2 columns, leave the next column blank, and put small quotes in the remaining column. You can see examples of this in the guide. The point is that it's up to you to decide how you want to present your information and that you use a grid to maintain consistency. You can break the grid (go outside the lines), but there has to be a reason for it and it must be consistent, otherwise it will look out of place or as a mistake.
Here is some more advanced information on choosing grids: [link]
The point of a grid is that it's a guide you make for yourself. There's no magic answer for what works best. It's simply a matter of does it have harmony and does it provide consistent structure.
If you don't mind me asking, is there also a rule of thumb for changing the type of grid from page to page? Is it considered more appropriate to keep the same grid for a number of pages before changing it up? What are your thoughts on this?
I like it.
My graphic design class has been doing a lot with grids lately. I'll bring this up to my professor tomorrow in the hopes we can all use this to get a better read on setting them up. Thanks for this tutorial!