Although, I'm not meant to do this....
Should I begin crying now or later on....
First of all.... Speech reckon with a microcontroller ( DSP micro for sure ) or PC...
Second is hell easy, just need to fine tune a program on PC....
First.... ooohhh my.... You need to know... math, dsp programming, programming, algos, math again....
and well..... if it's not for dedication and time.... (some years....) forget it...
The car thing is another problem... Cars, suffer from 1.5 degree of freedom in movement...
This is called Ackerman steering....
You can't move a car parallel to axon of the wheels headings (when not steering)
You have to "park" the car to do so... which is quite complex thingy.....
Differential drive is by far easier....
By this time more complex problems have arouse which I'm not gonna elaborate before you tell us
your level of experience...
Best regards,
Lefteris, Greece