I've never bought instructions, but have made a couple different tutu's just on my own after looking at some in the store. One was a "no sew". I just tied strips of tulle to an elastic that fit my dd's waist. Another one I gathered tulle and sewed it to a wide ribbon making the waist band so that it would tie around her waist (did not like that, I prefer it to be an elastic waist so dd could dress herself). Another one I sewed the tulle to the wide ribbon, folded the ribbon over to make a casing and inserted elastic. I bet you could put the flowers in one of the last two kinds I mentioned.
I could try to talk you through it if you want.
Do you have a picture of a tutu dress? If I saw one, maybe I could figure out how to make it??