alot of sound advice has been given but for the first break in runs on your OS46AX you might need a elec starter just for the first few,getting mine to start and run well enough to flip start took at least 5 runs/flights,even then the first start up of the day sometimes takes some RPM's that fliping just won't give,knowing how much to properly prime and the proper tecnique for flip starting takes some learning.
elec.starters are safer and easy to use they keep your fingers out of the prop and are cheap,as in 30$ new with a battery.
I like em,use em,and endorse em, for the beginner modeler,as much as it's cool to have that old school talent in the bag,I prefer to preach the safest method for learning to operate machines that are capable of amputation.