When I downloaded the game, I was unable to find a manual/instructions. Did I miss this?

No, you don't miss it. There is no manual, but you can play the tutorial mission, which explains a lot. Also take a look into the settings for the control buttons. Normally, it should be easy to learn, how to control the game.

Yep, it's a new trend. You buy a new car, and there is no user instructions with it. Just turn it on and drive until you learn all the controls. You are going to kill a couple of people in the process, but who cares? Your insurance is going to cover the legal costs, and the manufacturer has saved a few cents.