Let's Make Robots!

The Circuitry for a Hovercraft

Hello, I am very new to circuits and building things in general and I've been spending a lot of time trying to learn the circuits and those sorts of things for building a hovercraft.

 

My hovercraft consists of 2 propulsion fans and 1 levitation fan and a 12V battery. I will eventually need to add an array of LED and IR sensors, a Light sensor and possibly a distance sensor. And the two servos are for the propulsion fans. I have the basic concepts of the battery and fans so far I think. I am a little confused on certain parts.