You'll need two paddles, a couple ping pong balls (you lose them quickly), and a net with the two clamps. Many stores sell ping pong kits, such as Sears and Amazon. You can usually get them for a reasonable price, and before playing, attach the net to a large rectangular table (a dining room table would be good) with the two clamps. Get out two paddles, a comrade, and a ball, and we'll begin. Allons-y!
Call heads or tails, and flip a coin to determine who goes first. The winner gets the ping pong paddle and ball, and will serve. To serve, throw the ball in the air, and hit it with the paddle so that it hits the other players side of the ping pong table. If the ball either hits your side of the table when you served, or if it doesn't hit the table, the other player gets a point. If the ball hits the other players side and the other player does not hit it, the point is yours, and you serve again. If you hit the ball on the other persons side, and they hit it back to you, continue hitting it back and forth until one of three things happen.
1. Someone hits the ball and it doesn't hit the table.
2. Someone lets the ball bounce twice on their side.
3. Someone hits the ball, but it hits their side of the net.
When one of these things happen, the person who did not commit the wronging gets the point. The person who gets the point serves. A traditional game of ping pong goes to eleven points. At match point, when one person has 10 points, the person who does not have match point serves. In the occasion where two people are tied at 10-10, a player has to win by two to win the game. Also, a shutout can occur when one player has eight points and the other has zero.
Go have a great time!