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They do sell price guides for Sports Memorabilia that feature signed baseballs. However most are out dated and the new Autographs might have changed in value. You could search eBay for closed auctions or auction archives at a number of on line auction houses. This will give you an idea of value. Take note of condition and authenticity as compared to yours.
Individually signed baseballs usually have the autograph on the sweet spot; the shortest distance between two seams. This location on the baseball is the most preferred by collectors because it is centered as to the point of view, and pleasing to the eye when displayed. The other "sweet spot" is were the manufacturing stamping is placed on the ball.
The "sweet spot" on team signed baseballs are typically reserved for the manager of the team, or and the teams most popular player. The choice of the player that signs the "sweet spot" can effect the value of the baseball.