There's no such thing as toning!
It's a myth invented by the fitness/advertising machine to calm fears of women who think they're going to "bulk" if they do weight and resistance exercises. What most women mean by "tone" is they want strong, fit muscles, but not a "weightlifter" look.
The good news there is that you cannot get that bulky weightlifter look unless you are specifically trying to do it - including extreme workouts, extreme diet changes, and often some form of medication (legal or otherwise).
Since you're working at home, what you probably want are more body resistance exercises, but do look into maybe picking up some weights and/or resistance bands to use at home as well.
To work on your lower body, I'd recommend:
lunges (all kinds - back, forward, walking, side-to-side, etc.)
deadlifts (you can do this with 2 milk jugs filled with sand or water for additional weight)
all kinds of crunches (including ball crunches) will work your core (abs and back)
planks and pushups will also work your core and back as well as your upper body
I strongly recommend you look into the book New Rules of Lifting for Women, which is what I use. You can also try Body for Life which has similar information in it.