I used the following websites:
I made a 5 decade rosary using black onyx (6mm) for the decades and red coral beads (8mm) for the gauds. I also used black embroidary thread. I knotted the thread a few inches from the end before threading on the beads. Once I had all the beads on, I knotted the end a centimetre or so from the last bead, so that they may move along the thread when praying. I passed the two ends of the thread through another bead before tying off again.
With the remainding embroidary thread, I made a small tassle, using this website for help. I then tied the tassel to the loose ends of the rosary and trimmed to neaten it.