First of all you need some grapes. About 15 years ago I planted four merlot vines given to me by a friend who worked erecting fences for vineyards. Three grew and now extend over about 25 metres on a wire trellis in a cage covered in chook wire to keep off the eager birds.
This year was the best crop ever - two trugs and three large boxes. After giving away a box this was my haul for wine making.