@Erreul You could do it that way. For instance, an RC car, if it has a DC motor for the drive wheels this would just connect up to a HBridge. If just the one motor you would only need half of the 2 motor HBridge and as a result only 2 digital ports (based on the TB6612FNG Motor Controller I used in Melvin).

Depending on how they work, and I assume steering is a servo on the front wheels/steering rack, which would just go on to a digital port, servo position 50 would be centre, change position up or down to turn left or right.

Or my Hearoid, an Omnibot, Omnibot 2000, RAD etc. uses 2 DC motors and gearbox to drive the wheels. 1 does the left hand wheels, the other the right hand wheels. Smack a HBridge in there, left hand motor on one output, right hand on the other output.

Not entirely essential, some RC items like the Wall-E U-Command can be modified to use modified servos for continuous rotation. But more often than not a HBridge is the easiest and most efficient method.