Look for a beginners' set that has a variety of colors. They will last a long time, and will very rarely have to be replaced. You can add to your color palette once you get the hang of this type of painting.
Choose a brand of turpentine to use in thinning your paint. Sometimes the tubes of paint are too thick for your particular idea or project. This is where turpentine comes in. When added to a color, it can decrease opacity, ultimately creating a thinner and more see-through effect.
Purchase good brushes. Do not buy cheap! Brushes are the most important part of your painting kit. Sable brushes are recommended more than any other type, due to their high quality. Cheaper brushes won't last, and may even affect your work.
Clean your brushes well. Your brushes will always be ready for use if you clean them properly in between sessions. Soak your brushes in turpentine and allow to dry on a paper towel. Then be sure to put them back at your workspace.
Use a porcelain palette. This type of palette is easily cleaned, great for mixing, and usually has a wide area to spread your colors.
Purchase a comfortable easel. An easel should always be adjusted at a workable height and placed in a well-lit area.
Get some canvas. Oil painting should always be done on canvas. It is never a good idea to paint on any other type of medium.
Get painting! Once you have all of your oil painting items in order, you can begin your first piece of artwork.
Practice mixing your paints with the turpentine, as well as mixing the colors on your palette to create new ones. Practice your brush strokes, and develop your very own oil painting techniques. Most importantly, have fun!