Many call designs begin with a standard center V-cut (or offset V) as the basis for the design. If you are making the calls for yourself, start with the V-cut and go from there, trying the call after each new cut. The progression is simple,....make a V-cut, then cut off one side tab to make a combo, then cut off both side tabs for a batwing,....or if you want to try a ghost-cut, instead of cutting the side tabs, cut the center tab out instead. If you are looking for the traditional cutter design, you would make your first cut as an offset cut angled toward the center of the call and remove the small tab.
You can get more elaborate with any of the designs by cutting tab edges or deepening cuts if you want to. Of course, the combinations for call designs are endless,....latex layers, thicknesses, colors, spacing, stretch, cuts,....and you can go crazy trying to find the right combinations for yourself. ....So good luck with it.