For 2-strokes it's a fairly simple process to winterize them... Really all you need to do is add some gas stabilizer to the tank, get as much water out of the exhaust as you can and then fog the engine. Fogging the engine is simply spraying fogging oil down the throat of the carbs until the engine cuts off.
The last thing to do is remove the battery and connect it to a smart charger that will cycle it to keep a fresh charge on it through out the winter months.
let me ask a dumb question, I did my GTI (it has a carb) but my other sea doo is fuel injected (RFI ?) so do I just need to spray the fog oil in the spark plug holes? or is there some place else it (fog oil) needs to also be applied?
Simply spray the fogging oil into the engine through the air intake. This will ditstibute it completely through-out the engine's internals. The engines are the same, it's just how the fuel is supplied thats different.
**Of course this is assuming you're not talking about a 4-stroke!!!