spinning staffs, in my experience, are nearly always weighted. Even if just a little bit. The weight at the end definitely keeps up the momentum and the spin. It all comes down to inertia (basic physics 101).
Fire staffs are ALWAYS weighted whether you want it to be or not. The kevlar and the fuel adds weight to the end.
I'd highly recommend getting yourself a staff, length is a personal thing it seems, some like short, some like long it all varies. Personally I love the contact stuff and much prefer a heaver overall staff with good weights at the end.
Good luck and have fun!
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I once learned every move that there was,
Every style, Every technique.
Then I woke up, and forgot it all,
So now I struggle to dream.