Welcome!
While there aren’t any videos on the Gimkit Creative Forum, there are some on YouTube. Here is a playlist I found, and some search results on YouTube. If you cannot find what you are looking for, try using the forum’s search bar at the top right of your screen similar to what Pixel said. There was a recent purge of images, so most guides no longer have them. If you have any specific or unanswered questions please feel free to ask them! 
Wires and channels are two entirely different things. You do not need to set up channels for wires to function and vice versa. For channels, make sure the device transmitting and the device receiving have the same channel!