Very good question. If you are learning SR, you'll have to (assuming your stance and stroke are technically sound) try and make the majority of your points drawing or stunning from one object ball to the other, avoiding rails where you can. To do that, you'll have to focus on speed control, always staying close to at least one of the object balls. Find some online collection of gather shots and practice those. Spend some time making small piques and massées, you'll frequently need those when the balls are close. Once you manage to gather with some success, you might want to start learning the Serie Americaine. Without good gathers, there's no progress. Finally, your question about runs: for any beginner, a run of 10 is a great accomplishment (because 7 or 8 will have been difficult shots). You'll be in the 20's quickly, once you can bring all three near a corner. For the advanced player: there little difference between a run of 50 and a run of 300 because it's all repetiton of the same two, three patterns. Somebody said: there's no substitute for up-close and personal lessons, and he was right.