well 5x5 pretty much is self explanatory. A general blueprint to these programs are using 5x5 as the volume range. This is in conjunction with long rest periods (2 - 3 mins) and Heavy Weights. 5x5 mainly targets compound workouts.
Squats, Deadlifts, Benchpress, Lunges, Military Press, Weighted Dips, weighted pull ups.
Those are the fundementals. These cazillion variations on them. The key is just to pick a program, fix a high calorie diet and stick to it.