The two best things you can do are pruning and fertilizing. Look around on the internet for some good info. on pruning. Most sites also have diagrams, which are very helpful. As far as fertilizing use a high phosphorous fertilizer such as 10-20-10 or the like. The middle number should be 20 or higher. Fertilize in the spring of the year just after last frost. This will help produce more blooms and bigger fruit.