BH is a great powder...

There is another learning curve associated with it as Semi says...

It is far to expensive to play with per shot...

T7 will work just fine and be a good learning experiance

The Pryo's are dirty and corrosive but also and in expensive way to start....

Pellet but use Pyro Pellets, and Power Belts are the easiet way in the world to start... but ween your way off of both as soon as possible. With these two combination you need less accesories to get started and it more difficult to make a mistake... it will get you shooting and each shot will lead to a learning experiance that you can apply and get better as you move up the learning curve.