I don't normally draw schematics for such simple stuff, but as you are a noob, here it is.
N.B. You *MUST* protect the regulator Vin against transients and overvoltage. How much protection it needs is a matter of opinion - I prefer 'bullet-proof' for my own projects, as I'm protecting a lot of time, effort and materials invested in them, but for a cheap commercial product, it would often only be the minimum protection needed for most of them to survive long enough to go out of warranty. How to protect the regulator input in an automotive application is heavily dependent on the level of protection required, the load current, and whether the regulator must be capable of riding through the worst transients at full load current or if the application can shed loads or even shutdown, so I am *NOT* going to discuss it here at this time. There have been many threads about such protection on the forum, so do some research, come up with a proposal, and ask for criticism.