I'm only 10 yrs, old and I really want a pockeknife...?

You should have a talk with your parents. Explain to them why you want a pocket knife and how you use it. Listen to them and don't give them a hard time if they decide not to give you one. I know this is probably not the answer you would like to hear but it is the best advice. Part of being a knife owner is being responsible enough to take care of it and ensuring that no one comes to harm from it, yourself included. No one  knows you better than your parents so they are the best people to talk to about this. Good Luck

I got this knife and I want to know what it is worth....?

This question is rarely answered. People are slow to offer dollar values on knives they have not personally handled. Knives generally show up in various states of preservation. The best bet is to search for the same model knife for sale online somewhere.

What steel makes a good knife....?

Most of the commonly used steels in knifemaking today make excellent knives. The choice of one over the other depends on application and personal preference