its comming a long but imma recomment you to a nice tut to get started by my friend P.Y.R.O. Personally, his mesh on the start could use a bit of work but its such a great way for NoObs to get started in understanding proper techniques.

With This tut, its only the fender/hood but its a good start for models with a ncie poly count
https://www.sektor-41.com/forum/showthread.php?t=405

This is a whole 350z tut but the poly placement it too low poly for myself and looking at the mesh, u can see more errors and bumps which isnt good but again these are for Noobs to get a great understand of how to model a car and they are both 350z tuts
https://www.3dm3.com/tutorials/maya/350z/

With both sites u have to register but these should point u in the right direction. Good luck mate

PS the way i leard to model is to go to sites like smcars..net or cg-cars.com. when ur on smcars.net so a search for the car ur doing and look at their mesh. study how they get their flow trust me, it works. i look at all the great modelers poly placements all the time so i mean eevn its its a car that u dont like, check out the thread and see if its modeled nice cause then u can see how they modeled through there mesh and it will help out 100x