Here's what I do at home, and I do this every other day.
-Pushups Wide (chest) and close (tricep)
-Side to side crunches (sideabs)
-Inverted planking (something I do myself, idk if it exists, I just sit on my butt with my back and legs in the air straining my abs.)
-Alternating Deltoid Raise
And that's about it. I don't do leg workouts cuz I have track in school everyday.
But ontopic, get yourself some weights, they are really cheap to be honest.