i will be leaving and need help with long term storage!

Is it going to be sitting un-touched or able to be started sometimes??

If untouched I would consider oil-ing down the cylinders. Yes on fuel stabilizer in the tank. Try to fill with REC gas if you can, due to ethanol blended fuels of today, REC gas here doesnt have it.
I would somewhat plan on dropping the tank when you get it back to where you can run it. 1 to empty the not great fuel, and also to make sure didnt get anything inside the tank.

Best would be if you could start it every once in awhile.

I have found dryer sheets to work as good as mothballs but without the smelll. I would defenently add some to the interior for sure, as well as under the hood.