Fitness models lift CRAZY HEAVY, and they are NOT BULKY-- they are lean and toned. Don't be afraid to lift heavy!! You can only build so much muscle as a woman.
Some people prefer a total body workout, some prefer to break up the different muscle groups into separate days. Just remember to rest your body adequately. If you work your muscles too often, you won't continue to see results, rather you will continuously tear the muscle fibers and not allow them to build back up.
That being said, you have to be pretty hardcore to train to the level of depreciating your muscle mass in a lifting program. As long as you're not in pain, it's generally safe to lift those muscles again.
There are so many books out there, and I think they're generally good at explaining how to do the exercises-- the routine however-- depends on you. I absolutely HATE working every muscle in my body in a single day. I do two muscle groups (i.e. back and biceps) in a single day, 3 sets of 12 reps.
And I let my BODY tell me how heavy to lift. Meaning, I want to barely be able to do my 11th and 12th rep. On the 3rd set, I'm nearly crying. Some may say this is too much exertion, but it definitely works!
-> don't forget to use a exercise log to document how much you are lifting, so that you can tell if you're actually making any progress in the gym.
-> I do something similar to this while I'm at the gym, in case I can't finish the reps or I lift heavier in subsequent reps (every bit that you can tell you've progressed will keep you motivated to continue):
Make sure you start something you enjoy. If you're taken to the brink of quitting, it's because you're over- or under-training.
Get ready to love the pain of sore muscles
