Hi!
As "Fourstroke" said.....If you are a rank beginner inverted engines are not for you! That simple!
Inverted engine always will provide much more trouble than an "ordinary" set-up will. It is hard to reach the glowplug, hard to disconnect the glowplug without sticking ones fingers in the prop and sometimes the engine could have difficulties with idling and throttling.
I always try to mount my engines tilted to the left...with the right side up for easy reach to the carb needle and fuellines. One more benefit with this installation is that you get the engine axle higher up which benefits fueltank installation and prop to ground clearance.
Regards!
Jan K
Sweden