First to make the bunting figure out if you want a patter for your letters/colors and print out your letters.
Next I like to draw a top line. This will be the top edge of each flag.
I’ve said many times before I am not a perfectionist so from here I just cut points. I liked that each flag was a little different but if that will bug you by all means measure away.
After you arrange the flags in order (and triple check it) pull a long take on your sewing machine. You can always cut it shorter.
Then just start sewing. You don’t need to change your presser foot, needle or anything but if you sew a lot on paper it may dull your needle so you might want to change it when you go back to sewing fabric (I did not).
Just sew and add the next flag being mindful of spacing.
At the end leave a long tail.
If you are not going to use the bunting right away I find it super helpful to wrap it around a piece of cardboard and attach a few pieces of tape. So much better than dealing with a tangled mess and trying not to rip paper when you’re dealing with other last minute party details.
To put it on the cake just stab the cake with some skewers and tape or tie the string on.