ok, im not going to be a jerk and say search because this has been answered so many times. any ways, there are multiple ways or doing this. you can buy backer rod, like say you want 40 dreds that are 3 ft long get 80 feet. it will cost ya 13 bucks. they are not flowy though. but look good and cheap, and there is a tutorial in the huntorial section.
here is my way: buy a stake or something dread shaped. wrap cheap black fabric(you can pick it up and jo annes) and wrap it around the stake. find where the ends meet and cut there. now sew the ends together. stuff it with some kind of flexible light weight foam type material. close up the top with another peice or fabric, sewing or hot glue since you wont really see the glue there. buy some returned black latex house paint(lowes or home depot(since buying a fresh gallon costs like 60 bucks)) and dip it in there. let it dry, it will add some wight but should make it more flowy. if it is not flowy enough you can put a fishing weight in the dreads, whatever size make you happy.
i hope this helps
