Point me in the Right Direction?

If you know the exercises in the program you have ordered. I would spend the next few days doing those lifts with very very light weight. Basically the bar. And really work on getting my technique down. So when the program arrives your ready to go.

That's the thing!  I'm not exactly sure what kind of weightlifting program is inside the Tuff Cuff program!  I guess I'll have to find out when it gets here!  I have read the program description many times, and it tells what is offered inside but doesn't tell in detail

I admire your desire to better yourself as a pitcher and as an athlete.

As far as a weight training program, just like a pitching program there is a lot involved other than just lifting weights.

You need to be on a specific diet to eat enough, as well as the right things, to get the benefits from a training program.

You also have to remember a lot of this is about mother nature and you have to learn to cooperate with her as she won't with you. 

I am not sure what type of serious weight training a 15/16 year old needs, but maybe more band work, plyo, core and leg work, toss program. Do you play another position, if so you got to get two birds with one stone, so to speak.  Don't do anything unless you know what you are doing. 

If your school has a trainer you might want to see if he/she might have some pointers because they know you.  Remember you can  lots of info from the internet but that may not be the right info for you.

I know that you have done lots of homework and asked lots of questions, but make sure what you do is RIGHT for you.