Careful with weight lifting ( females) it will increase your calorie intake, hence eating more. Some people tend to bulk up, rather than achieve and maintain a healthy weight. Just a disclaimer.
I say back to basics, stick to planks and push ups if you want toned and defined arms. I never lift more than 8 pounds on each arm, and focus more on using my own body weight for balance and strength. Of course, no harm if you want to go much higher. Weightlifting for women has become very popular nationwide, and many women love the muscle defined look. All preference..
Lastly,
Go Libby! 