I have come across another question.
Several of the patterns I have been looking at say co a certain amount of st and add 3 or 6 etc. for the stitch.
How do you handle those extra stitches when you start that first row?
We really would have to see how it's worded in order to answer that. The pattern you linked to doesn't say that. However the stitch pattern
instructions say "Cable Pattern, (multiple of 12 sts plus 6)" which mean the cable pattern is worked over multiples of 12 sts (12, 24, 36, 48, etc) plus 6 sts which are used to make the pattern come out right.