Measure and cut 6 inches of craft wire, using the flush cutters. You can adjust the length of the wire for the size you're making. If you need larger than a size 7, make the wire longer. Conversely, shorter for smaller sizes.
Place the middle of the wire around the ring mandrel at your ring size. Wrap the wire around the mandrel to start to find the base shank of the ring. This is the start of shaping the ring shank.