I string mine individually. Usually put them in groups (mallards together, woodies together, etc.) and leave a landing "hole" infront of where I am sitting. You want to try to make them land where you want them to land, which is where you can smack 'em. The most important thing is to make sure that you set up where the wind is coming from your back. They will nearly always land into the wind, so if it is at your back and your landing area is infront, the action should be on a string in your face.
If you don't have any motion dekes, think about a jerk cord to give your spread some life. You will be surprised how much motion helps. If you do have motion dekes, spinners, etc. make sure they face into the wind.
Good luck, man. Let us know how you do.