tsk tsk tsk, you are not looking very hard are you? On this very forum is a sticky thread entitled 'exercises without weights' in which you will find a wealth of basic knowledge regarding plyometric or 'explosive' exercises.
Call me a softie, but i am even going to save you the effort of clicking onto that thread, here is a relevant excerpt:


Plyometrics are exercises without a decelerative phase, the part where you slow down to come to a stop at the end of the movement. They teach your nervous system to act explosively, and to utilise the force stored in an eccentric stretch, such as the wind-up for a punch, or the ducking motion before a jump. When training for power, reps should generally be limited to 6, as any fatigue will be detrimental. It is easy to overtrain on plyometrics; it's normally recommended to do them 1-4 days a week, 15-40 exercises per session (i.e. across all sets), depending on your level of development.
There are many lower-body plyometric drills, but they're mostly just slight variations on jumping, with no special benefits over simply jumping into the air, so I've thought it necessary to list only a few of the most important here. These should be all you need for a complete plyometric routine. This page describes them well and gives internal links to lists of exercises.
Depth jumps and shock jumps were the two original plyometric drills devised by Soviet sports scientist Prof. Yuri Verkhoshansky, who feels that much of what passes for plyometrics now - i.e. any jumping exercise - misses the point of the original plyometrics, namely to teach your nervous system to store compressed energy in the muscle tendon unit and release it explosively in the opposite direction. I feel that depth jumps and shock jumps should form the core of any lower-body plyometric routine. They are extremely effective exercises for increasing jumping ability, which is very important in wushu and some other martial arts.

Plyometric push-ups. From the bottom position of a push-up, push explosively off the ground to throw your upper body off the ground. An important exercise for anyone training in a martial art that punches with the power of the arm.
Plyometric pull-ups. Hang from a pull-up bar and pull yourself up explosively, letting go of the bar as you ascend, so that your hands come up above the bar.
Depth jumps. Drop (don't jump) from a height and, as soon as you hit the ground, jump up as high as possible. Your heels should not touch the ground. The height you drop from depends on your level of development. 45-70cm will do for most people, though advanced athletes use heights of up to 125cm. The horizontal distance you travel as you drop should be equal to the height you drop from.
Shock jumps. Drop from a height of 100-125cm and land as softly as possible, without your heels touching the ground. This exercise teaches you to absorb forces in your Achilles' tendon. As with depth jumps, the distance you land away from the object should be roughly equal to its height.
Jumps. Practise jumping straight up into the air and landing softly. Try it tucking your knees into your chest, bringing your feet behind you, or from one leg only.
Ankle bounces. Jump as high as you can without bending the knee, using only the ankle.

Shadow, an inquiring mind is a valuable thing, but so is the capacity to research existing info. Many of your questions can be answered in the numerous 'sticky' threads at the top of the first page- they are effectively a resource for many FAQ's- and well worth a read.
Don't let the door hit ya' where the good lord split ya'