A pair of sharp eyes, a clear and flexible mind, a bold enough...
Money...
To buy art that truly increases in value, your eyes, your mind, your guts, are thousands of times more important than money... First of all, do not listen to people recommend, say famous, famous people to buy, many of these are expensive and worthless things, you would rather buy some, not very famous people's works, the price is not expensive, the appreciation space is very big...
Try to buy a unique "original"... Those "fine arts and crafts", there is not much room for appreciation, sometimes can not "value", celebrities are not useful. Because there is so much production, you have to remember that "scarcity is valuable."
Look at the difficulty of the hand, than look at the color is much more important. Many times the color will make you dizzy, many crafts tens of dollars, the color looks beautiful, but you collect 100 years is not worth a few money... The manual difficulty of artworks, handicrafts are difficult to imitate, carving hand is much more difficult than hand pinch...
See if the work is intact, no cracks, whether it has been repaired, to see clearly, ask clearly... Is the price reasonable...
360 degrees, watch the work, whether it is natural and perfect, compared with other works, whether it is similar...
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Remember, with your little help, you and your friends can get more useful things...