Ride on child’s road train

I want to build a ride on child’s toy train.
I want it to be remote control and speed would need to be limited to 6mph or easily controlled
The total weight including construction and passengers would be around 100kg
I have no problem constructing it but have a little electrical experience and no experience in remote control.
I would need parts list preferably from Amazon
I would need to control the motor speed, forward and reverse. I would need to control the steering with an actuator.
The motor should stop and steering centred when joystick released. It should have a 6mm sprocket with 11 teeth and be brushless
I would need a battery level indicator and charging point.
Key to turn on/off
A kill switch on remote controller and top of train to stop all functions.
You should provide simple instructions/drawings on how to connect the parts.
From my research I believe an arduino would be used and would need to be programmed. I would need support to do this.
Your part of the project is to identify parts and how they connect to work.
I would like advice on which motor to buy and comparison prices it needs to brake.
The instructions/communication should be in good English.
I would not allow access to my computer.
I would carry out the work in my spare time so it might be about 2-3 months to complete the electrical side of the job.