I'm curious about how to make a dual engine aircraft.

Would it be possible to have both engines wired and powered on the same channel? Or will that cause a resistance problem such as with stereo speakers? I just want to know before I make something from scratch that I don't fry something out. I'm not the most electronicially minded person so I'm asking first before I regret it

I was also curious if there are any outlets that sell micro kits - setups for planes of 20" and smaller. I notice that some of the REALLY small planes use little actuators...