[Lefty]

Well I think your battery is toast doesn't matter if when standing still it reads 12V. As soon as you put a load on it if it is bad the Voltage will drop like a rock. So if you have a Volt Meter connect it to the battery and hit the start button and see the reading I bet it reads very low.

Also for the KICK START do you have the KILLSWITCH ON THE RUN position and the Sidestand up(just in case it has a killswitch as well).

Sitting that long without starting there probably isn't much gas in the Carb Bowl since it is a 150 you most likely have a 24mm Carb and it has a VENT TUBE bent down on the LEFT side of the CARB you can twist the hose up and pour at least 1 0z of fuel into it.

When you squeeze the brakes do the STOP LIGHTS COME ON?
Ususally if you push the start button and you hear clicking either the battery is weak or bad or the solenoid is bad. You can also try giving the Solenoid a whack as your pushing the start button sometimes the contact inside gets stuck and giving it a whack might free it.
Lefty