Unity 2D - Programming enemies for a 2D top down car game (c#)

Hello !

I want to learn how to program an enemy car for my 2D game. Far as I'm concerned the best method is to have a scripted entry from beneath the road, and then follow the player at a slower speed and attempt to shoot at them. An alternative enemy would be one that tries to collide with them for damage.

My game is very barebones at the moment, I currently have a scrolling background of a road and the player's car which can move and shoot. I imagine adding collision would be better to do after adding the enemies.

If I'm missing any information, let me know.

Thank you.