The correct way to fire up the engine in an automatic car is to keep the gear lever in 'P' position, depress the brake pedal, and then press the start button.
In traffic, if you know that the vehicle is going to be at a standstill for a long duration (30 seconds or more) at a red light or in a traffic jam, it is advisable to shift to 'N'.
This practice will not only prevent your Honda Elevate from creeping forward, but it'll also remove the stress from the brakes and prevent the gearbox from heating up. 
