An opening bid of 2C (strong 2) requires at least 23 points or a hand with a self-sufficient suit that is at least within one trick of game. You may open with fewer points if your suit is long and strong and your hand meets the other requirements
A good, 5+-card suit (preferably a 6-card suit, especially if it's a minor).
Good quick tricks and controls in the other suits (A, K, shortness)
Playing strength to take at least 8 1/2 to 9 tricks if your suit is a major; 9 1/2 to 10 tricks if your suit is a minor