making an electric go-kart

Hello, I am looking to make an electric go-kart for my niece. I will be using a 24 DCV motor from a scooter. I am trying to make a list of what all I will need for the electrical controls. I will be using two 12v batteries wired in series. I am planning on then wiring a toggle switch to power it on, followed by a light to tell that it is on. The part that I am not to sure about is my speed controls and also my control for motor direction. I would like to do a pedal type system, or like a boat throttle type, but not sure how to do that. Also to control the direction of the motor, i will need a motor control correct? I'm thinking of using another toggle switch to control the control. Where is a good place to purchase 24 DCV motor controllers. Thank you. Also, sorry for the long post.