How to shoot? (Formerly "Learning.")

[Black_knights55]

Hey,
I kind of know the really basic stuff but still, I'm new to scripting and I want to learn. I'm trying to script a simple weapon that throw anything. I first try to just throw an arrow, but the only thing I have is a shadow flying forward. If anyone can help me, I'd really like to know how exactly the functions work and where to put what in the parameters. Let's say I want my character to throw shuriken.png?

I have few mores questions after this one is solve, I'll just post them after that one. Thanks by the way for the help!