A canvas stretched the size of the painting you want to make. It is also a good idea to buy several small boards of canvas board to train and do preparatory studies. You can also use canvas paper or canvas in the notebook as long as they are suitable for oil painting and have been prepared with gesso. Try to choose a small board that has exactly the same proportions as your stretched canvas, but if you do not find one, take a larger board on which you can relate the shape of the canvas.
Oil paint tubes corresponding to a basic palette. If you buy a box, it should contain most of the essential colors.