So, how long have you been using DBPRO? What confused you about the Hands on Book? And what have you created so far?
You can insert code in the forum and whilst highlighted, the code button above the submission field will enclose the code in tags. You can also insert lang=dbp
inside the opening 'code' tag to have the forum syntax highlight your code.
Posting your code enables lots of experienced eyes to observe any paths you make towards any traps and barriers.
Again as was stated, a proper racing game is not easy; I can testify, it is taking me months to get my car to drive smoothly.
If you prefer racing games over FPS games, you might find that you will be more motivated to succeed if you stick with a racing game; or vise versa. A simple racing game you could create is like this old Micro Machines video game on the old games consoles. This should be fairly straight forward because the Y Axis (gravity vector) is static 99% of the time.
2D games can be realized in 3D, you can even change the camera angle to capture some interesting angles.
There is also a motorbike demo in the DBPRO example folder that could be modified into an old style motorbike game, or perhaps like Outrun in 3D.