Not sure if esky has changed things since I owned a belt cp but the stock ESC should have a 1.5a built in linear BEC.

So this is your first heli? Any time on a simulator? I'm guessing you have no heli flyer's around to help? Let me tell you flying helis is not easy...if they aren't set up right it's near impossible to fly one.

Without some help and simulator time your first hover will be short and expensive.