1. I'm from the US so my brain doesn't process things like kilograms and meters, but google said you are 6 ft and want to be about 200 pounds.
2. imo (not a professional opinion obviously) I think you should start small, go on nightly runs or something of that nature. Slowly make it harder, (I assume you are from Russia from the flag, and I don't know your lockdown status but if gyms are open then start going there) if you own weights then great and if you don't go to a gym or buy some, and start working out there (don't give up on the runs though). Obviously this will take a couple months, but if you are dedicated then you can do it. Just start easy, and slowly make it harder until you reach a point where you think is good and then keep to that point.
3. Same thing with food, it's rather hard to just stop eating bad food and only eat healthy. One way I did it was slowly 'skip' out on a desert, or an unhealthy snack. Every little bit can make a big difference, and always try and keep health in mind when buying food, not sure if you cook or not but whoever does cook (whether that be you, your partner, parents, or someone else) have them try and lower portion sizes (assuming you eat more then you should) and more importantly buy stuff A. Organic 2. Has vitamins, proteins, and good stuff. 3. Try and limit your sodium, fat, and carb intakes. Your diet is probably the most important thing here.
Hope this helps!