Have a look for 'the new rules of lifting for women' its great.
Other than that if you dont want to follow the books etc just start with your big compunding movements e.g, squats, lunges, deadlifts, push-ups (full or half), if you have access to a gym then also try some inverted rows also get some shoulder presses in there and perhaps some front raises also. i'll put some links below for form etc. good luck and dont be scared of going heavy, its the only way to get the definition you're after
Squat: http://www.bodybuilding.com/exercises/detail/view/name/barbell-squat
Lunge: http://www.bodybuilding.com/exercises/detail/view/name/barbell-lunge (can also do it holding dumbbells at your sides)
Deadlift: http://www.bodybuilding.com/exercises/detail/view/name/romanian-deadlift
Push-ups: http://www.bodybuilding.com/exercises/detail/view/name/pushups
Inverted rows: http://www.bodybuilding.com/exercises/detail/view/name/inverted-row
Shoulder press: http://www.bodybuilding.com/exercises/detail/view/name/dumbbell-shoulder-press
Front Raise: http://www.bodybuilding.com/exercises/detail/view/name/front-dumbbell-raise

Have fun xx