This video shows how to easily sew a simple, single point dart using your Brother LX-3125 sewing machine. Note: I'm using Single Point to mean that the dart has one point unlike the fisheye dart which is shaped like a sharp oval and has 2 points.
1 piece of muslin, preferrably with your basic bodice on it
Sewing machine (I use the Brother LX-3125)
Thread of course
scissors to cut your fabric