Because deep down inside i don't think you're an alias, I'm going to give you some advice.
My buddy throws them once in a while.  I mean as far as jump size goes, i'd say at least 50 ft for sure, but make sure it has a lot of kick.  The initial kick will help you bring it around (but you should probably know that from regular backs already).  I mean when it comes right down to it, you kinda just have to huck it out.  It's not a trick where you just ease into it.  Honostly, maybe wait until summer to try on a water ramp or something.  It's a fairly dangerous trick.  At least thats how my buddy learned them.