I had to write it out to see how I do it, but definitely with a b I draw the ligne first, and d I sart with circle first. As NIkita says, we write from left to right, so it makes no sense to write the circle on the b first, or to draw the line on the d before the circle part… one would have to think about how much space to the left of the line to leave for the circle of the d, and cross over to the left of the line to make the circle, and cross back to make the following letter.