Hi masturbating is healthy but don't expect the same amount each time you do it , the body has to have time to produce more sperm , its up to you how many times you do it but don't expect a better climax as the first one , you will come to no harm tasting your sperm at all , pre-ejaculate is clear its the body's lube comes when you are excited , its normal , Take care , Enjoy your Teens ,
After ejaculation, your sexual system relaxes. It takes minimum half an hour to get aroused again. There is a technique called -edging-. with this technique you can enhance pleasure as will as you train your brain to delay ejacuation. Google edging to learn the details.