can someone help me get started?

so i started my journey to lose weight, im 18 and im kind of a fat chud. im 6’3 270 lbs and i just really wanna not be as monstrously huge as i am. ive been working on trying to get 10k steps in, at least a 500kcal deficit, and every morning/night 10 pushups, 10 situps, and 10 squats. i want to gradually increase the amount of push ups i can do but for right now 10 is moderately difficult and id like to wait till it gets easier to increase to 12-15. am i going the correct route or am i doing something wrong?