Vehicle suspension and turning help

I want to make a car, but I don’t know how to make suspension or turning, I tried making turning by making a center gear and roping the axles to it. Didn’t work, any help?

http://www.facepunch.com/threads/827045-Suspension-Tutorial-Mk.II?highlight=tutorial

Karbine’s suspension tutorial of awesomeness.

Don’t complain to Panda; Ducky and I were the ones making suspension but you threw that chair at me and spazzed it out.