Do you have an idea, how to do deadlifts and cleans without "professional" weights and without a gym?

Bodyweight squats are good. So are chin-ups, pull-ups, dips, push-ups, burpees and planks. I'd avoid sit-ups, especially if you hunched over your desk all day. A fun way to spice up the workout is "Parkour".

My workout is running a few kilometers to a selected tree, doing some of the exercises above and running home. Takes about an hour each. Three times a week.