DC 36 v motor control


i want to make a drift trike and for contolling i want to use arduino PWM (havent done it before). So i would like to know if somebody has done some thing like this but without useing MOTOR SHIELD just a simple standart circuit which can be found every where.

The motor :

36 volts 1kW

An examples and explanation woud be great.

Not that you would find a 40Amp motor shield anywhere anyway.