Two
The team that threw the pallino gets to throw the first bocce ball. The point is to get the ball as close to the pallino as possible. (Again you can substitute baseballs or tennis balls. Just number them 1-4, two balls for each number.) That player steps aside and lets a member of the opposing team toss a ball, attempting to get it closer to the pallino. Each team altenates, tossing as close as possible to the pallino.
Three
Although this is forbidden in the actual game, we allow players to knock other balls out of the way.
Four
Scoring : the closest team receives one point for every ball it has closer to the pallino than the other team. In other words, if Team A has the three closest balls, it will receive 3 points. The second place team receives no score.
For the Official rules of bocce, click on the link to the United States Bocce Federation above.