grand-theft-auto-v,mods – How to Swap the Run/Walk Toggle in First Person Mode in GTA V on PC?

If you park a car in the garage, it will be saved there. Your standard car will always be available nearby if it is not in the garage. Parking in the garage will save that car and you can access there unless you left it somewhere else.

Taken from the manual:

Player characters can own any vehicle in [GTA V] as long they have appropriate storage for it. To purchase a new car they must first own a garage ... If a vehicle is destroyed it will reappear at any residential property that the character owns with a garage (note that this does not include safe houses). If an owned vehicle is lost, stolen or abandoned, it will be impounded. To retrieve impounded vehicles the character must pay a find of $250 and collect the vehicle

What you want isn't directly available in the game but I'd recommend using autohotkey etc. to press select 3 times when you are in third person and one time in first person. I will not provide example code.