If you see food lying on the ground, eat it. Same with medical kits stuff, sort of. You can smash things and get away with it. Smashing things doesn't hurt - in fact many nice things are hidden inside other things. If someone dies, they disappear.
All shopkeepers carry high-tech weaponry.
When you are born, you drop out of the sky and are completely invincible for a short time. Although them enemy lads always have more aircraft than you, they fly in elaborate patterns which make it easier for you to shoot them all down. All martial arts women wear revealing clothes and have great bods. And all martial arts men have rippling muscles and angry expressions. Driving any form of vehicle is simple and requires no training.