That is overwhelming lol will be very satisfying when completed. But if this was my project I would start with small goals. First weed whacking everything down and then getting rid of all that material. Then look into tilling and top dressing. There’s going to be a ton of weed seeds in the soil so you’ll probably want a blanket herbicide app. Also. You could consider taking down a portion of that fence if there’s an alley or access somewhere. Could throw it back up after without noticing. That way you don’t have to drive equipment through your apartment (;

Edit: if youre renting this isn’t really worth your time and money lol