There really is no one weight that teenagers "should" weigh. Everyone is different. Weight is influenced by many factors like height, age, frame size, activity level, muscle mass, etc. Ask your doctor if you're at a healthy weight.
weight training
Your weight is correct for your height. You should not try to lose weight - you can do some strength training to tone up, but your weight is exactly where you want it to be. Your weight is correct for your height. You should not try to lose weight - you can do some strength training to tone up, but your weight is exactly where you want it to be.
I found a few good sites on good weight training for woman online. Here are a few of the sites you should checkout exercise.about.com/cs/exerciseworkouts/a/workout_center.htm , and www.womenshealthmag.com/weight-loss/weight-training-tips
A weight training machine can pay off if you have the time and space for it. But a weight set is quicker and easier. If you wanted a training machine that is good, try a Bow Flex, as they are proven and reliable, and provide many different workouts.
eggs
absolutely not..in moderation...
People who are weight training should work out no more than every other day. To do weight and strength training every day would result in muscle tears and other stress injuries.
Most weight training belts are made of thick leather so as to provide the back with maximum support during the lift.
This is really a question you should be asking your coach. If your coach requires that you do weight training at school, then yes, you do need to do it. If you're already doing adequate weight training on your own, then he may waive this requirement, but it's also possible that he may prefer you do it under his supervision.
They should if they want to
No. Running before your weight training routine can exhaust you of all your energy and you may not be able to workout to your fullest capabilities. If you want to run, then you can push the running to past the weight training workout. This way you can both workout in best form and run.