Here is a tutorial on how to make inverse chevron friendship bracelets. It is easier if you start with only 2 colors. Make your knot up at the top, and tape the top of the bracelet to a work surface to hold it in place.
A good kind of thread to use is embroidery floss, available at craft and sewing stores.
It takes practice to do these right – but remember to always make a ‘4’ and to do each string twice. Get any supplies for jewelry making here: