Step 1

Start out drawing the basic shape of the letters as if they were sans serif style.
Step 2

Once you have the letters “ABCD” roughly drawn, go back over the letters to thicken those downstrokes. When drawing a serif type, be aware of the thick strokes versus thin strokes. Your downstrokes should be thicker. This adds to the classic, traditional feel of a serif font.
Step 3

With a sharp piece of chalk, add the serif to the top and bottom of the strokes. For a different effect, connect the serif to the body of the stroke by drawing a small, curved, diagonal connector. This is called a bracketed serif and will give the letter a completely different look. This piece was excerpted with permission <a href="http://www.amazon.com/gp/product/0761186115/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0761186115&linkCode=as2&tag=craftfocom-20&linkId=DXXLIYGES62V5EZC">The Complete Book of Chalk Lettering: Create and Develop Your Own Style</a>.