[header] How to add brushes in adobe illustrator [title] To start, create a brand new document. [step] Go to file] new or ctrl + n and set the size of the document to a vertical letter-sized canvas. Once you have created the vertical canvas, add guides, which is explained in the next step. 
[substeps] Add guides by creating a symmetrical rectangle using the rectangle tool, (w:8.5 in, h:11 in). After, drag the guides on each center of the bounding box, which you will find on the page.