I think new engines are intended to be hard to start to force the beginner to have experienced help and prevent the plane from having a less than 30 second life expectancy. Get some experienced help both with the engine and with your maiden flight.

Other than that, follow the advice above on priming, make sure your glow starter is fully charged. Backward flipping is a very good way to start a possibly flooded engine (read "just primed"). It will cause the fuel to ignite prior to the piston reaching Top Dead Center, causing the prop to turn in the correct direction while clearing the excess fuel from the cylinder.

Good Luck!
Brad