Do you actually have an artist, or any concept art for the game? Do you have a registered company?
You have to realize that it'd cost less man hours and money to just license something like Unreal Engine 4 or CryEngine. You could role out a game much quicker than you could from developing your own engine from scratch.
I agree with what Avilius said. Although my personal go to would be Unity (not in C++) because of it being free and all... but you are the boss, not me
I think more information would help people (there wasn't much provided on your last one either http://www.cplusplus.com/forum/jobs/135302/ ), though being 14 and the pay is a percent of the overall profit there might not be too many offers.