Open the throttle wide open. put a couple of drops of fuel in the carb inlet. Close the throttle and set the throttle trim to high, you should see just a small opening in the barrel. NOW flip the engine since it is primed. It should run long enough to draw fuel from the tank, if not - repeat the above. There are other ways but this is one of the easier to tell over the computer.
ANYTIME you move the propeller with the starter battery attached, be prepared for it to fire and TRY to whack a finger or worse. Control the prop in other words,
it can be a meat slicer. No fear, just respect.

Bruce[